>>17880373
Think about how impolite it is to expect hundreds of anons to copy and paste and search for a term, when you could have taken a couple of seconds to include a link.

>>17880410
Since OP isn't doing it, I'll do it.

Bermeja Island is an island located on several early Spanish maps of the coast of Mexico. Specifically, it's off the Yucatan Peninsula.

Currently, modern cartographers and surveyors have been unable to locate it and it's been suggested that it sank beneath the ocean.

I heard that scientists found in 2011 what the think is a submerged city in Spain, north of Cadiz. Supposedly, it was wiped out by a massive tsunami. Then, the city got buried in the mud flats. The tsunami explanation isn't implausible, seeing as tsunamis have been recorded in the area for centuries. Just what I found though