The following information dates from the original script that James Cameron wrote in 1995. Information here may conflict with the established continuity.
Equatorial Sea — the sea at the equator of the Pandora.
Below he can see mist-shrouded mountains, growing as they descend. The pilot tells them they are over the so-called "Horn" of Australis, the great southern continent, which juts up into the Equatorial Sea.