Gruta do Lago Azul Natural Monument is a natural monument in Bonito, Mato Grosso do Sul. It holds two caves with interesting but fragile calcareous formations, and has been listed as a protected area since 1978. The Gruta do Lago Azul has a circular entrance, about 40 metres in diameter, illuminating the lake with sunshine. Between the months of September and February the waters take on an intense blue color, for which the lake is named. Fossil bones have been found of large mammals that inhabited the region for more than 12,000 years in the Pleistocene. These include giant sloths, armadillos and sabre-toothed tigers.
RR: 10 Countries RR (20)
Date: July 18
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