Claim/criticism: "The Opposite Continent is Americas, and Atlantis must be in the Atlantic in between Americas and Old World. Kirchir's map shows Atlantis in the Atlantic."
There is no definite identification of the Opposite Continent with America(s) in the Atlantis Account. Atlantis was a large landmass, and there is no large sunken/submerged landmass in the Atlantic seafloor, plus the mid-Atlantic ridge is merging up and out not in and down, so Atlantis can't be there and must be America(s) while the Opposite continent must be beyond. It is perfectly possible that Atlantis could be (South) America(s) and the Opposite Continent beyond Atlantis could be either Antarctica, North America, Asia, Australia/Asutralasia/Antipodes or Lemuria/Mu.
The Opposite Continent was "opposite". Antarctica is opposite. Antipodes is opposite. Asia is opposite end of Eurasia/Old World.
The Opposite continent surrounded the ocean. Antarctica surrounds the world in the concentric projection centred on the North Pole. Antarctica is along the whole bottom of the world map. North America &/or Asia-Australia partly surrounds the Pacific ocean. The usual theory that it matches Americas bracketing one side of the Atlantic is not the only possible match.
The Account says Atlantis had control of "parts" of the Opposite Continent. This might match Antarctica which was partly ice free in some Pole Shift maps. Or it could match North America which was partly covered by Ice sheet in Ice Age.
The many other islands between Atlantis and the Opposite COntinent could match the Pacific Islands.
Kirchir is not necessarily a reliable source. Kirchir's Atlantis looks alot like South America (or North America). South America is centered further east than North America. Atlantis and the Opposite Continent might match 2 of the 3 large islands of Zeus/Jupiter/Ammon, Poseidon/Neptune/Atlantis and Hades/Pluto in the Western sea. America qualifies as being in the Atlantic (compare Nato). The Atlantic sea could have be on both sides of Atlantis/America. The Atlantic sea might be Lake Titicaca not the Atlantic Ocean? For people who place Atlantis in the Malta/Tritonis area to argue Atlantis was in the Atlantic ocean is a contradiction.