Phostaan

Description
Phostaan is largely barren, bit its atmosphere is theoretically capable of producing rainfall. Powerful localized storms could appear as often as three or four times a year.

River
DATA:
 * Source: Rainfall
 * Composition: Liquid water
 * Length: 2285 km

ANALYSIS: A violent and recent rainstorm must have occurred to create this river. The water will be absorbed or evaporated soon.