diff --git a/frontend/src/containers/map/content/details/tables/national-highseas/index.tsx b/frontend/src/containers/map/content/details/tables/national-highseas/index.tsx
index 26816be2..128d2844 100644
--- a/frontend/src/containers/map/content/details/tables/national-highseas/index.tsx
+++ b/frontend/src/containers/map/content/details/tables/national-highseas/index.tsx
@@ -123,8 +123,8 @@ const NationalHighseasTable: FCWithMessages = () => {
         protectedArea: mpa?.name,
         coverage: coveragePercentage,
         protectedAreaType: protectionStatus?.slug,
-        establishmentStage: establishmentStage?.slug || 'N/A',
-        protectionLevel: mpaaProtectionLevel?.slug || 'unknown',
+        establishmentStage: establishmentStage?.slug,
+        protectionLevel: mpaaProtectionLevel?.slug,
         area: mpa?.area,
         dataSource: dataSource?.slug,
         iucnCategory: iucnCategory?.slug,
diff --git a/frontend/src/containers/map/content/details/tables/national-highseas/useColumns.tsx b/frontend/src/containers/map/content/details/tables/national-highseas/useColumns.tsx
index acaf263b..dd951d6b 100644
--- a/frontend/src/containers/map/content/details/tables/national-highseas/useColumns.tsx
+++ b/frontend/src/containers/map/content/details/tables/national-highseas/useColumns.tsx
@@ -213,7 +213,8 @@ const useColumns = ({ filters, onFiltersChange }: UseColumnsProps) => {
         cell: ({ row }) => {
           const { establishmentStage: value } = row.original;
           const formattedValue =
-            establishmentStageOptions.find((entry) => value === entry?.value)?.name || t('n-a');
+            establishmentStageOptions.find((entry) => value === entry?.value)?.name ||
+            t('not-assessed');
           return <>{formattedValue}</>;
         },
       },
@@ -234,7 +235,8 @@ const useColumns = ({ filters, onFiltersChange }: UseColumnsProps) => {
         cell: ({ row }) => {
           const { protectionLevel: value } = row.original;
           const formattedValue =
-            protectionLevelOptions.find((entry) => value === entry?.value)?.name || t('n-a');
+            protectionLevelOptions.find((entry) => value === entry?.value)?.name ||
+            t('not-assessed');
           return <>{formattedValue}</>;
         },
       },
diff --git a/frontend/translations/en.json b/frontend/translations/en.json
index 08c0f4e2..fdfb6879 100644
--- a/frontend/translations/en.json
+++ b/frontend/translations/en.json
@@ -258,6 +258,7 @@
       "iucn-category": "IUCN Categories",
       "mpas": "MPAs",
       "n-a": "N/A",
+      "not-assessed": "Not assessed",
       "oecms": "OECMs",
       "fully-highly-protected": "Fully/Highly Protected",
       "global-contribution": "Global contribution",