The Fima colony was an Enaran colony located in the Fima system, in the Delta Quadrant.

In 2373, the USS Voyager transported a number of Enarans from the Fima colony to their homeworld Enara Prime, saving them a significant amount of travel time. In exchange, the Enarans shared their energy conservation technology and their friendship. (VOY: "Remember")

This colony was only mentioned in dialogue.
The episode implied that the colony was made possible thanks to terraforming technology.
Jessen said she lived "in" the colony.