This article is about the planet Oannes. For species also known as Oannes, see Ohnes.

Oannes, designated P3X-866 by the Tau'ri, is home to the Ohne species. It is one of three moons of a gas giant in Milky Way Galaxy and sometime in the past was visited by the Ancients, whom left a Stargate behind.

Oannes has a large sea along with several small volcanic pockets, along the beach, which sprays out hot steam. (SG1: "Fire and Water")

Oannes' Stargate is located in a desert region, a piece from one of the moon's great salt sea. And 30% of the surface covered by a salty sea and has five major oceans. (RPG: "Friends and Foes: Stargate Season Two")