The Golan Heights were part of Syria until 1967, when Israel captured most of the area in the Six Day War, occupying it and annexing it in 1981.
That unilateral annexation was not recognised internationally, and Syria demands the return of the territory.
Syria tried to regain the Heights in the 1973 Middle East war, but was thwarted.
Israel and Syria signed an armistice in 1974 and the Golan had been relatively quiet since.
In 2000, Israel and Syria held their highest-level talks over a possible return of the Golan and a peace agreement.
But the negotiations collapsed and subsequent talks also failed.
The Golan is a hilly 1,200 square kilometre (460 sq mile) plateau that also overlooks Lebanon and borders Jordan.
Israel wants the Golan for security reasons.
It says that the civil war in Syria demonstrates the need to keep the plateau as a buffer zone between Israeli towns and the instability of its neighbour.
More than 40,000 people live on the Israeli-occupied Golan - more than half of them Druze residents.
The Druze are an Arab minority who practice an offshoot of Islam and many of its adherents in Syria have long been loyal to the Assad regime.
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