<Tr> <Th> Longest river </Th> <Td> Ayeyarwady River </Td> </Tr> <Tr> <Th> Largest lake </Th> <Td> Indawgyi Lake </Td> </Tr> <P> Myanmar (also known as Burma) is the northwestern-most country of mainland Southeast Asia, bordering China, India, Bangladesh, Thailand and Laos . It lies along the Indian and Eurasian Plates, to the southeast of the Himalayas . To its west is the Bay of Bengal and to its south is the Andaman Sea . It is strategically located near major Indian Ocean shipping lanes . </P> <P> Total Land Border Length: 6,522 kilometres (4,053 mi) </P>

What natural boundary lies between thailand and laos