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
Eastern South Asia India. East Bengal was later renamed East Pakistan in 1955. In 1971, East Pakistan seceded in the Bangladesh Liberation War, which established the People's Republic of Bangladesh. The constitution of Bangladesh established a multiparty parliamentary democracy in 1972. The country endured several military coups in the late 1970s and 1980s. Islam is the state religion of Bangladesh. In the Indian state of West Bengal, the Communist Party of India governed for three decades. The Eastern Himalayas has been home to three independent kingdoms since the 17thcentury, including the Kingdom of Bhutan, the Kingdom of Sikkim, and the Kingdom of Nepal.