A study by the Hebrew University of Jerusalem of an underground water reservoir beneath the Judaean Desert known as the Judaea Group Aquifer, found that the aquifer begins in the Judaean Mountains and flows in a northeasterly direction towards the Dead Sea with outflows at the Tsukim, Kane, Samar and Ein-Gedi springs. The rain-fed aquifer contains an average yearly volume of some 100 million cubic meters of water.