The waterworld named Mon Cala was located in the Mon Calamari system of the Calamari sector in the Outer Rim Territories. The planet was situated in the eastern region of the galaxy known as The Slice. A moon orbited the planet with no atmosphere and a barren terrain. Mon Cala was in the Standard Galactic Grid square U-6.

The oceans of Mon Cala held an abundance of life, including two influential sentient species; the peaceful Mon Calamari and the more bellicose Quarren species. Both species preferred to build their cities underwater, but there also existed some cities built on the surface of the water. The planet was ruled by a single monarch. Despite their differences, the two peoples had generally shown mutual respect throughout their history.

Coral grew in large colonies on Mon Cala, with their hard skeletons forming coral reefs that acted as shelter and feeding and breeding grounds for various species of fish, crustaceans, and other sea life. The coral tended to thrive in areas bathed in the light of Mon Cala’s twin suns, but some hardier species dwelt out of the light deep below the surface. In these deep sea beds of limited light, bioluminescence was a common trait for plants.

Although sparce, small islands dotted the surface of Mon Cala, with many of these islands forming archipelagos. The terrain of these islands ranged from rocky cliffs, to sandy beaches with dense jungle. The polar regions were colder then the rest of the planet with ice floes located in the north. Some Quarren and Mon Calamari left their homeworld to avoid its politics, instead settling the moon of Trask.