Looks like all they knew about at the time the map was made was what we call Florida.
NEA taught librarian: geometry, geology, geography, same diff.
What did they think they knew and how'd they GET that way?
If you look at the equator it seems as it is part of the east coast of South America, like Brazil.
At the time this map was drawn, probably no Europeans had seen Florida. Apart from the Scandinavian explorers centuries earlier, the only parts of North America known to have been seen by Europeans by 1507 were Newfoundland and perhaps Nova Scotia and/or New England by John Cabot, and parts of Central America by Columbus. Juan Ponce de Leon’s discovery of Florida was several years later. Magellan’s exploration of the coast of South America began in 1519. Amerigo Vespucci had been a passenger on a ship that explored part of the coast of Brazil, and a Portuguese explorer en route to India accidentally ran into Brazil in 1500. Waldseemuller did pretty well given the limited amount of information available at the time.