Burma, officially the Union of Myanmar, is the largest country by geographical area in Indochina (mainland Southeast Asia). The country is bordered by China on the north-east, Laos on the east, Thailand on the south-east, Bangladesh on the west, India on the north-west and the Bay of Bengal to the south-west with the Andaman Sea defining its southern periphery. One-third of Burma's total perimeter, 1,930 kilometres (1,199 mi), forms an uninterrupted coastline.