The Southern Reservoir was a large water reservoir on the planet Darkknell during the Republic Dark Age. It was located within the capital city Xakrea and was situated nearby Sith Lord Daiman's fortress of Sanctum Celestial. During the Battle of Darkknell in 1032 BBY, the rain and floods that were artificially unleashed by Hutt crime lord Zodoh's Stormdrivers caused the reservoir to burst its banks, flooding Daiman's palace.