diff --git a/frontend/src/components/terrestrial-data-disclaimer-dialog.tsx b/frontend/src/components/terrestrial-data-disclaimer-dialog.tsx
new file mode 100644
index 00000000..34125427
--- /dev/null
+++ b/frontend/src/components/terrestrial-data-disclaimer-dialog.tsx
@@ -0,0 +1,52 @@
+import { useAtom } from 'jotai';
+import { useTranslations } from 'next-intl';
+
+import { Button } from '@/components/ui/button';
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from '@/components/ui/dialog';
+import Icon from '@/components/ui/icon';
+import { terrestrialDataDisclaimerDialogAtom } from '@/containers/map/store';
+import Notification from '@/styles/icons/notification.svg';
+
+interface TerrestrialDataDisclaimerDialogProps {}
+
+const TerrestrialDataDisclaimerDialog = ({}: TerrestrialDataDisclaimerDialogProps) => {
+  const t = useTranslations('pages.progress-tracker');
+  const [, setOpen] = useAtom(terrestrialDataDisclaimerDialogAtom);
+
+  return (
+    <Dialog open>
+      <DialogContent closable={false}>
+        <DialogHeader className="flex-row gap-2 font-bold text-red">
+          <Icon icon={Notification} className="h-6 w-6" />
+          {t('important-notification')}
+        </DialogHeader>
+        <DialogTitle className="max-w-[350px]">
+          {t('terrestrial-data-disclaimer-dialog-title')}
+        </DialogTitle>
+        <DialogDescription>
+          {t.rich('terrestrial-data-disclaimer-dialog-content', {
+            br: () => <br />,
+          })}
+        </DialogDescription>
+        <DialogFooter>
+          <Button
+            type="button"
+            className="font-mono text-xs font-normal normal-case"
+            onClick={() => setOpen(false)}
+          >
+            {t('i-understand')}
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  );
+};
+
+export default TerrestrialDataDisclaimerDialog;
diff --git a/frontend/src/components/tooltip-button/index.tsx b/frontend/src/components/tooltip-button/index.tsx
index fa02b8b1..fa12d510 100644
--- a/frontend/src/components/tooltip-button/index.tsx
+++ b/frontend/src/components/tooltip-button/index.tsx
@@ -1,4 +1,4 @@
-import { Fragment, useState } from 'react';
+import { Fragment, ReactNode, useState } from 'react';
 
 import Linkify from 'react-linkify';
 
@@ -20,9 +20,15 @@ interface TooltipButtonProps {
   className?: string;
   text: string;
   sources?: Source | Source[];
+  extraContent?: ReactNode;
 }
 
-const TooltipButton: FCWithMessages<TooltipButtonProps> = ({ className, text, sources }) => {
+const TooltipButton: FCWithMessages<TooltipButtonProps> = ({
+  className,
+  text,
+  sources,
+  extraContent,
+}) => {
   const t = useTranslations('components.tooltip-button');
 
   const [isTooltipOpen, setIsTooltipOpen] = useState<boolean>(false);
@@ -65,7 +71,7 @@ const TooltipButton: FCWithMessages<TooltipButtonProps> = ({ className, text, so
 
         {Array.isArray(sources) && (
           <div className="">
-            <span>Data sources: </span>
+            <span>{t('data-sources:')} </span>
             {sources.map(({ id, title, url }, index) => (
               <Fragment key={id}>
                 <a
@@ -91,6 +97,7 @@ const TooltipButton: FCWithMessages<TooltipButtonProps> = ({ className, text, so
             {t('data-source')}
           </a>
         )}
+        {extraContent}
       </PopoverContent>
     </Popover>
   );
diff --git a/frontend/src/components/ui/dialog.tsx b/frontend/src/components/ui/dialog.tsx
index 38061251..acec9b10 100644
--- a/frontend/src/components/ui/dialog.tsx
+++ b/frontend/src/components/ui/dialog.tsx
@@ -21,7 +21,7 @@ const DialogOverlay = React.forwardRef<
   <DialogPrimitive.Overlay
     ref={ref}
     className={cn(
-      'fixed inset-0 z-50 bg-white/80 backdrop-blur-sm data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0',
+      'fixed inset-0 z-50 bg-black/30 data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0',
       className
     )}
     {...props}
@@ -31,23 +31,27 @@ DialogOverlay.displayName = DialogPrimitive.Overlay.displayName;
 
 const DialogContent = React.forwardRef<
   React.ElementRef<typeof DialogPrimitive.Content>,
-  React.ComponentPropsWithoutRef<typeof DialogPrimitive.Content>
->(({ className, children, ...props }, ref) => (
+  React.ComponentPropsWithoutRef<typeof DialogPrimitive.Content> & {
+    closable?: boolean;
+  }
+>(({ className, children, closable = true, ...props }, ref) => (
   <DialogPortal>
     <DialogOverlay />
     <DialogPrimitive.Content
       ref={ref}
       className={cn(
-        'fixed left-[50%] top-[50%] z-50 grid w-auto max-w-lg translate-x-[-50%] translate-y-[-50%] gap-4 border border-slate-200 bg-white p-6 pt-10 shadow-lg duration-200 data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[state=closed]:slide-out-to-left-1/2 data-[state=closed]:slide-out-to-top-[48%] data-[state=open]:slide-in-from-left-1/2 data-[state=open]:slide-in-from-top-[48%] sm:rounded-lg',
+        'fixed left-[50%] top-[50%] z-50 grid w-auto max-w-[600px] translate-x-[-50%] translate-y-[-50%] gap-6 border border-black bg-white p-10 duration-200 data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[state=closed]:slide-out-to-left-1/2 data-[state=closed]:slide-out-to-top-[48%] data-[state=open]:slide-in-from-left-1/2 data-[state=open]:slide-in-from-top-[48%]',
         className
       )}
       {...props}
     >
       {children}
-      <DialogPrimitive.Close className="focus:ring-slate-950 absolute right-4 top-4 rounded-sm opacity-50 ring-offset-white transition-opacity hover:opacity-100 focus:outline-none focus:ring-2 focus:ring-offset-2 disabled:pointer-events-none data-[state=open]:bg-slate-100 data-[state=open]:text-slate-500">
-        <X className="h-4 w-4" />
-        <span className="sr-only">Close</span>
-      </DialogPrimitive.Close>
+      {closable && (
+        <DialogPrimitive.Close className="focus:ring-slate-950 absolute right-4 top-4 rounded-sm opacity-50 ring-offset-white transition-opacity hover:opacity-100 focus:outline-none focus:ring-2 focus:ring-offset-2 disabled:pointer-events-none data-[state=open]:bg-slate-100 data-[state=open]:text-slate-500">
+          <X className="h-4 w-4" />
+          <span className="sr-only">Close</span>
+        </DialogPrimitive.Close>
+      )}
     </DialogPrimitive.Content>
   </DialogPortal>
 ));
@@ -60,7 +64,7 @@ DialogHeader.displayName = 'DialogHeader';
 
 const DialogFooter = ({ className, ...props }: React.HTMLAttributes<HTMLDivElement>) => (
   <div
-    className={cn('flex flex-col-reverse sm:flex-row sm:justify-end sm:space-x-2', className)}
+    className={cn('mt-4 flex flex-col-reverse sm:flex-row sm:justify-end sm:space-x-2', className)}
     {...props}
   />
 );
@@ -70,11 +74,7 @@ const DialogTitle = React.forwardRef<
   React.ElementRef<typeof DialogPrimitive.Title>,
   React.ComponentPropsWithoutRef<typeof DialogPrimitive.Title>
 >(({ className, ...props }, ref) => (
-  <DialogPrimitive.Title
-    ref={ref}
-    className={cn('text-lg font-semibold leading-none tracking-tight', className)}
-    {...props}
-  />
+  <DialogPrimitive.Title ref={ref} className={cn('text-xl font-black', className)} {...props} />
 ));
 DialogTitle.displayName = DialogPrimitive.Title.displayName;
 
@@ -82,11 +82,7 @@ const DialogDescription = React.forwardRef<
   React.ElementRef<typeof DialogPrimitive.Description>,
   React.ComponentPropsWithoutRef<typeof DialogPrimitive.Description>
 >(({ className, ...props }, ref) => (
-  <DialogPrimitive.Description
-    ref={ref}
-    className={cn('text-sm text-slate-500', className)}
-    {...props}
-  />
+  <DialogPrimitive.Description ref={ref} className={className} {...props} />
 ));
 DialogDescription.displayName = DialogPrimitive.Description.displayName;
 
diff --git a/frontend/src/components/widget/index.tsx b/frontend/src/components/widget/index.tsx
index 21df360b..8d4aaf4a 100644
--- a/frontend/src/components/widget/index.tsx
+++ b/frontend/src/components/widget/index.tsx
@@ -1,4 +1,4 @@
-import { ComponentProps, PropsWithChildren, useMemo } from 'react';
+import { ComponentProps, PropsWithChildren, ReactNode, useMemo } from 'react';
 
 import { timeFormatLocale } from 'd3-time-format';
 // eslint-disable-next-line @typescript-eslint/ban-ts-comment
@@ -31,6 +31,7 @@ type WidgetProps = {
   errorMessage?: ComponentProps<typeof NoData>['message'];
   info?: ComponentProps<typeof TooltipButton>['text'];
   sources?: ComponentProps<typeof TooltipButton>['sources'];
+  tooltipExtraContent?: ReactNode;
 };
 
 const d3Locales = {
@@ -50,6 +51,7 @@ const Widget: FCWithMessages<PropsWithChildren<WidgetProps>> = ({
   errorMessage = undefined,
   info,
   sources,
+  tooltipExtraContent,
   children,
 }) => {
   const t = useTranslations('components.widget');
@@ -69,7 +71,9 @@ const Widget: FCWithMessages<PropsWithChildren<WidgetProps>> = ({
       <div className="pt-2">
         <span className="flex items-baseline justify-between">
           {title && <h2 className="font-sans text-xl font-bold leading-tight">{title}</h2>}
-          {(info || sources) && <TooltipButton text={info} sources={sources} />}
+          {(info || sources) && (
+            <TooltipButton text={info} sources={sources} extraContent={tooltipExtraContent} />
+          )}
         </span>
         {!showNoData && lastUpdated && (
           <span className="text-xs">{t('updated-on', { date: formattedLastUpdated })}</span>
diff --git a/frontend/src/containers/map/sidebar/main-panel/panels/details/widgets/terrestrial-conservation/index.tsx b/frontend/src/containers/map/sidebar/main-panel/panels/details/widgets/terrestrial-conservation/index.tsx
index 4c999806..4825f9b6 100644
--- a/frontend/src/containers/map/sidebar/main-panel/panels/details/widgets/terrestrial-conservation/index.tsx
+++ b/frontend/src/containers/map/sidebar/main-panel/panels/details/widgets/terrestrial-conservation/index.tsx
@@ -1,14 +1,18 @@
 import { useMemo } from 'react';
 
+import { useAtom } from 'jotai';
 import { groupBy } from 'lodash-es';
 import { useLocale, useTranslations } from 'next-intl';
 
 import ConservationChart from '@/components/charts/conservation-chart';
 import { Button } from '@/components/ui/button';
+import Icon from '@/components/ui/icon';
 import Widget from '@/components/widget';
+import { terrestrialDataDisclaimerDialogAtom } from '@/containers/map/store';
 import { useSyncMapContentSettings } from '@/containers/map/sync-settings';
 import { formatKM } from '@/lib/utils/formats';
 import { formatPercentage } from '@/lib/utils/formats';
+import Notification from '@/styles/icons/notification.svg';
 import { FCWithMessages } from '@/types';
 import { useGetDataInfos } from '@/types/generated/data-info';
 import { useGetProtectionCoverageStats } from '@/types/generated/protection-coverage-stat';
@@ -29,6 +33,8 @@ const TerrestrialConservationWidget: FCWithMessages<TerrestrialConservationWidge
 
   const [{ tab }, setSettings] = useSyncMapContentSettings();
 
+  const [, setDisclaimerDialogOpen] = useAtom(terrestrialDataDisclaimerDialogAtom);
+
   const { data, isFetching } = useGetProtectionCoverageStats<
     ProtectionCoverageStatListResponseDataItem[]
   >(
@@ -163,6 +169,19 @@ const TerrestrialConservationWidget: FCWithMessages<TerrestrialConservationWidge
       loading={isFetching}
       info={metadata?.info}
       sources={metadata?.sources}
+      tooltipExtraContent={
+        <Button
+          type="button"
+          variant="text-link"
+          size="sm"
+          className="-mt-3 justify-start gap-1.5 px-0 py-0 text-xs font-bold normal-case text-red"
+          onClick={() => setDisclaimerDialogOpen(true)}
+        >
+          <Icon icon={Notification} className="h-4 w-4" />
+
+          {t('data-disclaimer')}
+        </Button>
+      }
     >
       {stats && (
         <div className="mt-6 mb-4 flex flex-col">
diff --git a/frontend/src/containers/map/store.ts b/frontend/src/containers/map/store.ts
index 87ed12c4..d157f111 100644
--- a/frontend/src/containers/map/store.ts
+++ b/frontend/src/containers/map/store.ts
@@ -2,7 +2,7 @@ import { MapLayerMouseEvent } from 'react-map-gl';
 
 import { Feature } from 'geojson';
 import { atom } from 'jotai';
-import { atomWithReset } from 'jotai/utils';
+import { atomWithReset, atomWithStorage } from 'jotai/utils';
 
 import { CustomMapProps } from '@/components/map/types';
 import { LayerResponseDataObject } from '@/types/generated/strapi.schemas';
@@ -40,3 +40,11 @@ export const modellingAtom = atomWithReset<{
   data: null,
   errorMessage: undefined,
 });
+
+/**
+ * Whether the disclaimer dialog should be visible
+ */
+export const terrestrialDataDisclaimerDialogAtom = atomWithStorage(
+  'terrestrial-data-disclaimer-dialog',
+  true
+);
diff --git a/frontend/src/layouts/map.tsx b/frontend/src/layouts/map.tsx
index 998e6850..f23f9d15 100644
--- a/frontend/src/layouts/map.tsx
+++ b/frontend/src/layouts/map.tsx
@@ -1,5 +1,8 @@
 import { PropsWithChildren, useEffect } from 'react';
 
+import dynamic from 'next/dynamic';
+
+import { useAtomValue } from 'jotai';
 import { useResetAtom } from 'jotai/utils';
 import { useTranslations } from 'next-intl';
 
@@ -7,9 +10,20 @@ import Head from '@/components/head';
 import Header from '@/components/header';
 import Content from '@/containers/map/content';
 import Sidebar from '@/containers/map/sidebar';
-import { drawStateAtom, modellingAtom } from '@/containers/map/store';
+import {
+  drawStateAtom,
+  modellingAtom,
+  terrestrialDataDisclaimerDialogAtom,
+} from '@/containers/map/store';
 import { FCWithMessages } from '@/types';
 
+const TerrestrialDataDisclaimerDialog = dynamic(
+  () => import('@/components/terrestrial-data-disclaimer-dialog'),
+  {
+    ssr: false,
+  }
+);
+
 const LAYOUT_TYPES = {
   progress_tracker: 'progress-tracker',
   conservation_builder: 'conservation-builder',
@@ -30,6 +44,7 @@ const MapLayout: FCWithMessages<PropsWithChildren<MapLayoutProps>> = ({
 
   const resetModelling = useResetAtom(modellingAtom);
   const resetDrawState = useResetAtom(drawStateAtom);
+  const terrestrialDataDisclaimerDialogOpen = useAtomValue(terrestrialDataDisclaimerDialogAtom);
 
   useEffect(() => {
     if (type !== LAYOUT_TYPES.conservation_builder) {
@@ -48,6 +63,9 @@ const MapLayout: FCWithMessages<PropsWithChildren<MapLayoutProps>> = ({
         }
         description={description}
       />
+      {type === LAYOUT_TYPES.progress_tracker && terrestrialDataDisclaimerDialogOpen && (
+        <TerrestrialDataDisclaimerDialog />
+      )}
       <div className="flex h-screen w-screen flex-col">
         <div className="flex-shrink-0">
           <Header />
diff --git a/frontend/src/pages/progress-tracker/[locationCode].tsx b/frontend/src/pages/progress-tracker/[locationCode].tsx
index 1b23f4f6..582b2571 100644
--- a/frontend/src/pages/progress-tracker/[locationCode].tsx
+++ b/frontend/src/pages/progress-tracker/[locationCode].tsx
@@ -30,6 +30,7 @@ ProgressTrackerPage.layout = {
 
     return {
       title: location?.[locationNameField],
+      type: 'progress-tracker',
     };
   },
 };
diff --git a/frontend/src/styles/icons/notification.svg b/frontend/src/styles/icons/notification.svg
new file mode 100644
index 00000000..189d5271
--- /dev/null
+++ b/frontend/src/styles/icons/notification.svg
@@ -0,0 +1,3 @@
+<svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M4 19V17H6V10C6 8.61667 6.41667 7.3875 7.25 6.3125C8.08333 5.2375 9.16667 4.53333 10.5 4.2V3.5C10.5 3.08333 10.6458 2.72917 10.9375 2.4375C11.2292 2.14583 11.5833 2 12 2C12.4167 2 12.7708 2.14583 13.0625 2.4375C13.3542 2.72917 13.5 3.08333 13.5 3.5V4.2C14.8333 4.53333 15.9167 5.2375 16.75 6.3125C17.5833 7.3875 18 8.61667 18 10V17H20V19H4ZM12 22C11.45 22 10.9792 21.8042 10.5875 21.4125C10.1958 21.0208 10 20.55 10 20H14C14 20.55 13.8042 21.0208 13.4125 21.4125C13.0208 21.8042 12.55 22 12 22ZM11 13H13V8H11V13ZM12 16C12.2833 16 12.5208 15.9042 12.7125 15.7125C12.9042 15.5208 13 15.2833 13 15C13 14.7167 12.9042 14.4792 12.7125 14.2875C12.5208 14.0958 12.2833 14 12 14C11.7167 14 11.4792 14.0958 11.2875 14.2875C11.0958 14.4792 11 14.7167 11 15C11 15.2833 11.0958 15.5208 11.2875 15.7125C11.4792 15.9042 11.7167 16 12 16Z" fill="currentColor"/>
+</svg>
diff --git a/frontend/tailwind.config.js b/frontend/tailwind.config.js
index 0f1fa166..d462e2d1 100644
--- a/frontend/tailwind.config.js
+++ b/frontend/tailwind.config.js
@@ -33,6 +33,7 @@ module.exports = {
         orange: '#FD8E28',
         violet: '#AD6CFF',
         'gray-300': '#999999',
+        red: '#F43F4C',
       },
       maxWidth: {
         screen: '100vw',
diff --git a/frontend/translations/en.json b/frontend/translations/en.json
index 4724ad6c..78efa932 100644
--- a/frontend/translations/en.json
+++ b/frontend/translations/en.json
@@ -98,7 +98,12 @@
       "outro-button": "Get in touch",
       "looking-for": "I am looking for..."
     },
-    "progress-tracker": {},
+    "progress-tracker": {
+      "terrestrial-data-disclaimer-dialog-title": "Terrestrial Conservation Coverage Data Disclaimer",
+      "terrestrial-data-disclaimer-dialog-content": "Protected area totals and trends in this dataset are derived from publicly available boundaries sourced from Protected Planet. However, some countries restrict the release of detailed protected area boundaries, leading to differences between our totals and those reported by the World Database on Protected Areas.<br></br><br></br>Due to these data restrictions, our protected area totals are lower both globally and in regions where boundaries are not publicly accessible.",
+      "i-understand": "I understand",
+      "important-notification": "Important notification"
+    },
     "conservation-builder": {}
   },
   "containers": {
@@ -230,7 +235,8 @@
       "explore-terrestrial-conservation": "Explore Terrestrial Conservation",
       "explore-marine-conservation": "Explore Marine Conservation",
       "terrestrial-existing-conservation": "Existing terrestrial conservation coverage",
-      "not-assessed": "Not assessed"
+      "not-assessed": "Not assessed",
+      "data-disclaimer": "Data disclaimer"
     },
     "map-sidebar-layers-panel": {
       "layers": "Layers",
@@ -360,7 +366,8 @@
     },
     "tooltip-button": {
       "info": "Info",
-      "data-source": "Data source"
+      "data-source": "Data source",
+      "data-sources:": "Data sources:"
     },
     "ui-carousel": {
       "previous-slide": "Previous slide",