Mesopotamia was first (1535) suggested by G.F. Oviedo y Valdes as the location of Atlantis. After its inundation he claims that the survivors fled to the Americas.

Mesopotamia has recently been entered into the Atlantis Stakes by Andreea Haktanir. Her website^(a) has an extensive article that takes 14 chapters to conclude that Atlantis was Mesopotamia. Although I found her theory interesting, I was was not convinced.

Coincidentally, there is a region of Argentina called Mesopotamia that has also been identified as the location of Atlantis.

^(a) http://www.haktanir.org/