diff --git a/src/main/resources/site/parts/highmap/Highmap.jsx b/src/main/resources/site/parts/highmap/Highmap.jsx
index f115988ab..8fa7c4bc1 100644
--- a/src/main/resources/site/parts/highmap/Highmap.jsx
+++ b/src/main/resources/site/parts/highmap/Highmap.jsx
@@ -86,7 +86,7 @@ function generateSeries(tableData, mapDataSecondColumn, color) {
       // dummy series to show outline of all areas
       allAreas: true,
       showInLegend: false,
-      opacity: 0.3,
+      opacity: 1,
     },
     ...Object.entries(dataSeries).map(([name, values]) => {
       return {