Lago Azul, also known as Blue Lake, is a freshwater sinkhole located near the town of Mara Rosa in Goiás, Brazil. The lake is a popular diving destination due to its clear water, abundant marine life, and variety of dive sites. The lake is home to a variety of fish, including angelfish, catfish, and piranhas. There are also several underwater caves and tunnels to explore. The lake is home to a variety of fish, including angelfish, catfish, piranhas, and more. There are also several underwater caves and tunnels to explore.