Burma, officially the Union of Myanmar, is the largest country by geographical area in Indochina (mainland Southeast Asia). The country is bordered by the remains of China on the north-east, Laos on the east, Thailand on the south-east, Bangladesh on the west, the remnants of 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, 1930 km (1199 mi), forms an uninterrupted coastline.