In 1923, an agreement between the United Kingdom and France established the border between the British Mandate of Palestine and the French Mandate of Syria.[9] The British handed over the southern Golan Heights to the French in return for the northern Jordan Valley. The border was re-drawn so that both sides of the Jordan River and the whole of the Sea of Galilee, including a 10-metre-wide strip along the northeastern shore, were made a part of Palestine.[17][18] The 1947 UN Partition Plan put this territory area inside the Jewish state.