Myanmar is the largest country by geographical area in mainland Southeast Asia. It is also known as Burma or the Union of Burma by many organizations and states. On 4 January 1948, Burma achieved independence from the United Kingdom as the "Union of Burma". Subsequent name changes were on 4 January 1974, to the “Socialist Republic of the Union of Burma”; 23 September 1988, to the "Union of Burma" and on 18 June 1989, the “Union of Myanmar” was adopted by the State Law and Order Restoration Council. Myanmar is bordered by the People's Republic of China on the north, myanmar on the east, Thailand on the southeast, Bangladesh on the west, and India on the northwest, with the Andaman Sea to the south, and the Bay of Bengal to the southwest. One-third of Myanmar's total perimeter, 1,930 km (1,199 mi), forms an uninterrupted coastline.