Sir Walter Raleigh described what was possibly a tepuy (table top mountain), and he is said to have been the first European to view Angel Falls, but these claims are considered far-fetched.
Some of the most spectacular are the Zacatón cenote in Mexico (the world's deepest water-filled sinkhole), the Boesmansgat sinkhole in South Africa, Sarisariñama tepuy in Venezuela, the Sótano del Barro in Mexico, and in the town of Mount Gambier, South Australia.