A mirage? So it may seem to summer hikers who come upon this sight after walking in blazing heat for several hours through the Wadi Kelt in the Judean desert. Today this abundant spring, called Ein Kelt (Ein in Hebrew means spring), provides a tropical swimming hole; 2,000 years ago aqueducts carried the water to the east near Jericho, where it filled the pools and watered the gardens at Herod the Great’s winter palace.