Although Poseidonis and Tritonis were the most famous of the submerged cities of the fabled and submerged continent of Atlantis on Earth-One, on other Earths both their versions of these metropolises and their inhabitants had different outcomes from the initial catastrophic events which had befallen them untold eons previous.
On Earth-Two, Aurania and Venturia... which were their world's version of Poseidonis and Tritonis respectively... had likewise been buried deep beneath the surface of the Atlantic Ocean. During the 1940's, both of these lands were raised to the surface from within the volcanic crevices they had resided throughout most of their histories. When Wonder Woman and Steve Trevor traveled to both locales, aiding Queen Eeras while opposed her rival Queen Clea, they were only the first of many who had encountered them. Other heroes, such as Superman, Batman and Robin, had likewise met with royalty from these cities including the offshoot merman and mermaid people of a satellite city.
Likewise, on Earth-S, Freddy Freeman aka Captain Marvel Jr. and his absent minded friend Professor Edgewise had likewise ventured to the domed city of one of these two Atlantis civilizations which had been conquered by the brutal Ruhk people who had been exiled to the doomed metropolis. After battling some of these brutes, the outcome of this encounter left the island city once more submerged beneath the wave of the city, nevermore to return.
It's counterpart on Earth-Two would be plundered during the 1960's by T.O. Morrow, who battled the Justice Society there. Then in the 1970's, Queen Clea would attempt to reconquer her former throne while battling Wonder Woman and her heroic allies. At the conclusion of this tale, thanks in part to devices she and King Kull of Earth-S had devised and utilized, Clea's Atlantis once more was submerged back into its' former home within the crust of the earth.