An undersea city, Y'ha-nthlei joins the ranks of Atlantis, Lemuria, and other cities sunk deep into the ocean. Y'ha-nthlei is only a few hundred miles out from Kingsport. It has countermeasures against detection, and even other sea peoples can't find it easily. Among the underwater nations, it's known for its stratified caste system setting those with psionic powers apart and above from those that don't.