This was also repeated and clarified by historian Pedro Sarmiento de Gamboa in 1572 in his "History of the Incas", who by calculation of longitude stated that Atlantis must have stretched from within two leagues of the strait of Gibraltar westwards to include "all the rest of the land from the mouth of the Marañon (Amazon River) and Brazil to the South Sea, which is what they now call America." He thought the sunken part to be now in the Atlantic Ocean but that it was from this sunken part that the original Indians had come to populate Peru via one continuous land mass. He says that South America was also known by the name of the Isla Atlanticus.