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
Himalayas into the mantle along an oceanic trench. An often-cited fact used to illustrate this process is that the summit of Mount Everest is made of marine limestone from this ancient ocean. Today, the Indian plate continues to be driven horizontally at the Tibetan Plateau, which forces the plateau to continue to move upwards. The Indian plate is still moving at 67 mm per year, and over the next 10 million years it will travel about into Asia. About 20 mm per year of the India-Asia convergence is absorbed by thrusting along the Himalaya southern front. This leads to the Himalayas