Photo gallery from Augusto Auler

Lake inside Inferno Cave, in the western state of Mato Grosso, Brazil.

Karren field at Curral de Pedras, state of Minas Gerais, Brazil.

Limeira limestone outcrop, Lagoa Santa Karst, Brazil.

Mocambo spring at the Lagoa Santa Karst, Brazil.

The São Francisco canyon in the Pains Karst area, Brazil.

Rhodamine being injected in the Poções karst lake, Lagoa Santa Karst, Brazil.

Karst lake at São Desidério, northeastern Brazil.

Massive cave passage at Janelão Caver, eastern Brazil.

Natural bridges at Wulong area, China.