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The most important rivers of Syria are the Euphrates, the Tigris, the Orontes and the Yarmouk River. All these rivers are shared between Syria and its neighbors. The Euphrates, by far the most important river in Syria, flows from Turkey through Syria to Iraq. In Syria, it is joined by the Khabur and the Balikh rivers, which both originate in the Syro-Turkish border region. The Tigris River originates in the eastern Taurus Mountains in Turkey and forms the border between Syria and Turkey on a small mountainous stretch of the river. Its mean annual flow is 18 km³/year, but very little can be used by Syria due to its remote location. The Orontes River, which flows from Lebanon through Syria to Turkey, has an average flow of 0.4 km³/year (13 m³/s). The water resources of the Yarmouk River, which is shared with Jordan and Israel and flows into the Jordan River, average some 0.4 km³/year (14 m³/s).