Tesnia was the homeworld of the Tesnians, located in the Alpha Quadrant. (ST reference: Star Charts) In 2151, the Enterprise rescued a group of Tesnians and returned them to Tesnia. (ENT episode: "Shuttlepod One") In 2382, DTI special agent Shelan was to accompany a group of scientists to Tesnia before she was removed from time. (DTI novel: Watching the Clock)