This is a shot I took while visiting Sao Miguel in the Azores at Lagoa das Sete Cidades ( "Lagoon of the Seven Cities"). It is a twin lake situated in the crater of a dormant volcano on the Portuguese archipelago of the Azores. It consists of two small, ecologically different lakes connected by a narrow strait, which is crossed by a bridge. The volcano is located on the western third of the island of São Miguel. The Lagoa das Sete Cidades part of a natural landscape of communitarian interest: it is the largest body of water in the region and one of the most important freshwater resources in the archipelago. This lake is very famous for the fact that is green on one side and blue on the other. Ref: Wikipedia.com. Shot with my Canon EOS 90D.