Gruta do Lago Azul Natural Monument

Gruta do Lago Azul Natural Monument
IUCN category III (natural monument or feature)
Nearest city	Bonito, Mato Grosso do Sul, Brazil
Coordinates	21°08′41″S 56°35′29″W / 21.1447°S 56.5915°W / -21.1447; -56.5915
Designation	Natural monument
Created	1978

Gruta do Lago Azul Natural Monument (Blue Lake Cave) is a natural monument in Bonito, Mato Grosso do Sul, Brazil. It holds two caves with interesting but fragile calcareous formations, and has been listed as a protected area since 1978.