 The Dinaric Alps contain the highest mountain in Croatia— Dinara—as well as all other mountains in Croatia higher than .Croatia's Adriatic Sea mainland coast is long, while its 1,246 islands and islets encompass a further of coastline—the most indented coastline in the Mediterranean.Karst topography makes up about half of Croatia and is especially prominent in the Dinaric Alps, as well as throughout the coastal areas and the islands.