The Dan River is the largest tributary of the Jordan river, whose source is located at the base of Mount Hermon. Until the 1967 Six-Day War, the Dan River was the only source of the river Jordan wholly within Israeli territory. Its flow provides up to 238 million cubic metres of water annually to the Hulah Valley. In 1966 this was a cause of dispute between water planners and conservationists, with the latter prevailing after three years of court adjudication and appeals. The result was a conservation project of about at the source of the river called the Tel Dan Reserve.