In 1868 Britain and Siam signed a treaty delimiting the Burma-Thai border from the Salween south to the Andaman Sea. Following some confusion as to the border's location, on the ground demarcation of the border commenced from 1889–92. In 1892 the northern section of the border delimited and then demarcated on the ground from 1893–94, with a final boundary treaty with maps signed on 17 October 1894. The northern terminus of the border was fixed in 1896 when the British and French agreed that the Mekong would serve as the Burma-Laos border. Some minor boundary adjustments occurred in 1929 and 1934. In 1941, following Japan's invasion of Burma, parts of Burma were ceded to Siam as the Saharat Thai Doem territory, however these areas were returned to Burma in 1946 following Japan's defeat and since then the border has remained in place. In 1937 Burma was separated from India and became a separate colony, gaining full independence in 1948, at which point the border became an international frontier between two sovereign states.