from the back cover:
Race to Recover a Font of Life
A remarkable device has been discovered in the wastes near the city-state of Tyr - a magical cistern created by a long-dead preserver named Aravek. You are charged to journey through the harsh desert land, brave fierce monsters, and retrieve the cistern before your enemies can claim it for their own cruel master. Can you bring a font of life-giving water to a parched populace? Or will you succumb to dangers beyond the gates of Tyr?
This Dungeons & Dragons adventure is designed for five characters of 4th level and is the feature for Worldwide D&D Game Day: Dark Sun. The Lost Cistern of Aravek includes a full-color battle map and ready-to-play encounters.