Sedele

Description
Despite its comfortable temperature and seas of liquid water, Sedele is heavily irradiated by mass ejections from the system's sun and is therefore unsuitable for colonization.

River
DATA:
 * Source: Spring
 * Composition: Liquid water
 * Length: 4354 km

ANALYSIS: Colonies of jellyfish-like creatures move freely along this enormous river, despite the lack of life elsewhere on the planet. The river may be the last remnant of a dying ecosystem.