The Apnex Sea is a body of water located on Romulus and lies of the coast of the capital city of Ki Baratan. (TTN novel: Taking Wing)
Prior to his defection to the Federation in 2366, Admiral Alidar Jarok resided near the Apnex Sea. (TNG episode: "The Defector")
Connections
Apnex Sea article at Memory Alpha, the wiki for canon Star Trek.