Bonito is a city and an ecotourism center in the state of Mato Grosso del Sur in southern Brazil. The surrounding area is known for crystal clear rivers, such as the river da Prata, a destination for snorkeling with abundant fish. The Anhumas Abyss is a huge stalactite-covered cavern, which allows rappelling and diving in an underground lake. Flocks of macaws nest in the deep ocher depression of Buraco das Araras.