In the west, a highland area of arable land and Mediterranean evergreen forestry drops suddenly into the Jordan Rift Valley. The rift valley contains the Jordan River and the Dead Sea, which separates Jordan from Israel. Jordan has a  shoreline on the Gulf of Aqaba in the Red Sea, but is otherwise landlocked. The Yarmouk River, an eastern tributary of the Jordan, forms part of the boundary between Jordan and Syria (including the occupied Golan Heights) to the north. The other boundaries are formed by several international and local agreements and do not follow well-defined natural features. The highest point is Jabal Umm al Dami, at  above sea level, while the lowest is the Dead Sea , the lowest land point on earth.The Dead Sea is the lowest point on earth.