Kahje

Kahje is an ocean planet with 90% of its surface covered in water, only small islands encompass the world's land area. It orbits an energetic white star, which results in a permanent blanket of clouds (not unlike the human colony world of Proteus). It is the homeworld of the hanar, a race resembling terran jellyfish, and the home to most surviving drell. The atmosphere is perfect for life; while containing some traces of ammonia, it consists of oxygen, hydrogen, and nitrogen, giving it an Earth-like atmosphere. The climate has also proved too humid for the drell, and they have found it more tolerable to live in climate-controlled domed cities. The vast worldwide ocean is known as the Encompassing.

Kahje is also dotted with Prothean ruins, which has shaped the religion and society of the hanar. Mount Vassla, an underwater volcano, is at the heart of one of the largest Prothean ruins on Kahje. The winners of the religious events of the hanar holiday of Nyahir (or "First Cresting Bloom") are inscribed in bioluminescence on the sides of the mountain for a year afterward.

Kahje must be under 1.5 billion years old if its star is class A5, which is equal to 2.1 Solar masses; this is much younger than Earth during the Ediacaran period (where Earth's cnidarians diverged from other animals). To get this head-start, Kahje was probably seeded with primitive algae, fungi or even primitive animal DNA from the outside (although not by the Protheans and not necessarily by any sentient visitor).

Trivia

 * Kahje is the terminus of an Illium-Kahje shipping lane.