Aquan

Aquan was the language of the Elemental Plane of Water.

Description
Aquan was a flowing language full of subtleties of meaning. Aquatic elves, hadozee, merfolk, tritons, water genasi, and locathah all spoke Aquan.

In the late 15 century DR, it was considered a dialect of Primordial, so that creatures who spoke one of the other elemental dialects such as Auran, Ignan or Terran could understand Aquan and vice-versa.