Brazil
The Troyana Series by Capt. S.P. Meek
The Troyana Series is two novels, The Drums of Tapajos (1930) and Troyana (1932) written by Capt. S.P. Meek. Explorers probe the Amazon and find a lost city, the remnants of lost civilizations.
Troyana by Capt. S.P. Meek
Troyana – the sequel to The Drums of Tapajos, Nankivell brings the adventurers back to Troyana to save it from a rebellion by the black robed Atlanteans.
The Drums of Tapajos by Capt. S.P. Meek
The Drums of Tapajos – After World War I is over, four men journey into the wilds of the Amazon basin in search of treasure. Somewhere in there they find a lost civilization.
Sunfire by Francis Stevens
Sunfire – Five explorers travel by canoe to the headwaters of the Rio Silencioso, to a hidden lake with an ancient pyramid. There they are seduced and trapped, and are fated to become human sacrifices to an ancient god.
The Treasure of Atlantis by J. Allan Dunn
The Treasure of Atlantis – A dying man, a hunter of rare orchids, returns from an expedition to Brazil and tells Stanley Morse of visions of a lost city deep in the jungles near the headwaters of the Amazon. Could it be the fabled city of Atlantis?