The correct answer is river Jordan.
Until the 1990s, Jordan and Israel were in constant conflict over water rights to the river Jordan. The issue of water sharing from the river Jordan–Yarmuk system turned out to be a major problem between Israel, Syria and Jordan. In the year 1965, there were three notable border clashes where Syrian shootings of Israeli farmers and army patrols the attacks were followed by Israeli tanks and artillery destroying the Arab heavy earth moving machines that were used as diversion plan.