US President Donald Trump has officially recognised Israeli sovereignty over the Golan Heights, in a move hailed as "historic" by the country's prime minister.
Benjamin Netanyahu was by Mr Trump's side as he signed the proclamation.
Syria said Mr Trump's decision was "a blatant attack on its sovereignty".
Mr Trump revealed last week he intended to overturn decades of US policy.
The western two-thirds of Golan Heights has been administered by Israel since the Six-day Arab–Israeli War in 1967, whereas the eastern third had remained under control of the Syrian Arab Republic, or later split between the government and opposition forces.
The region is located about 60km south-west of the Syrian capital, Damascus, and covers about 1,200 sq km.
President Trump makes a statement regarding the Golan Heights in Israel: pic.twitter.com/nqJoX25LpC— The White House (@WhiteHouse) March 25, 2019