Eastern South Asia is . Bangladesh has a tropical monsoon climate. The Sundarbans in Bangladesh, which is shared with India, is a UNESCO world heritage site. Cox's Bazar Beach is one of the world's longest beaches. Bhutan is roughly the size of Switzerland. It is located on the southern slopes of the eastern Himalayas, landlocked between the Tibet Autonomous Region to the north and the Indian states of Sikkim, West Bengal, Assam, and Arunachal Pradesh to the west and south. The land consists mostly of steep and high mountains crisscrossed by a network of swift rivers, which form deep valleys before draining into
Sino-Indian border dispute the Himalayas and the areas south of the Himalayas were traditionally Indian and associated with India. The high watershed of the Himalayas was proposed as the border between India and its northern neighbours. India's government held the view that the Himalayas were the ancient boundaries of the Indian subcontinent and thus should be the modern boundaries of British India and later the Republic of India. Chinese boundary markers, including one set up by the newly created Chinese Republic, stood near Walong until January 1914, when T. O'Callaghan, an assistant administrator of North East Frontier Agency (NEFA)'s eastern sector, relocated them