With its impressive mushroom-shaped limestone islands, the Republic of Palau forms a spectacular archipelago and is considered one of the top dive destinations in the world. The underwater scenery is stunning and marine life abounds, especially in nutrient rich sites like Blue Corner. There are very peculiar examples of marine adaptation, such as the Mastigias jellyfish which lost its stinging ability over evolutionary time as a result of becoming separated from natural predators in an isolated sea water lake.