Shared aquifers are a major source for domestic and agricultural water supplies in both Palestine and Israel. The western aquifer extends from the mountains of the West Bank to the coastal areas of Israel. The direction of flow is generally towards the west in this aquifer. The northeastern aquifer extends from the northern areas of the West Bank (Jenin and Nablus) towards the northeast (Beisan area) in Israel. These two aquifer systems are very important for supplying domestic and irrigation water to Palestinians and Israelis on both sides of the “Greenline. ” The extension of these aquifers in both countries makes them shared aquifers which require joint management.