Paititi bothered me most of all in Civ 6, maybe because it wasn't natural enough but a "lost city". This would have been a better option. The others didn't bother me too much but I didn't care for any more.Finallly about El Dorado, the best candidate for it was the Muisca and specifically Lake Guatavita, the Spanish found literal lake filled with gold, and in their minds it still wasn't "El Doradoy" enough,, curiosuly in North America they did the same looking for the 7 cities of gold. Almost like it was the popular fictional media of the time as well.
Due to the location I easily envisioned Bermuda Triangle as the Sargasso Sea and the Fountain of Youth as the Sacred Cenote.