Myanmar officially the Republic of the Union of Myanmar (formerly Burma), is a country in Southeast Asia. Myanmar is bordered by India and Bangladesh to its west, Thailand and Laos to its east and China to its north and northeast. Myanmar is the largest of the mainland Southeast Asian states. To its south, about one third of Myanmar’s total perimeter of 5,876 km (3,651 mi) forms an uninterrupted coastline of 1,930 km (1,200 mi) along the Bay of Bengal and the Andaman Sea.The country’s 2014 census counted the population to be 51 million people. As of 2017, the population is about 54 million. Myanmar is 676,578 square kilometres (261,228 square miles) in size. Its capital city is Naypyidaw (Nay Pyi Taw), and its largest city is Yangon (Rangoon). Myanmar has been a member of the Association of Southeast Asian Nations (ASEAN) since 1997.