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
Flora of the Indian epic period of the forest. In Geological Ages: palaeo-botanical evidence testifies to the fact that there were dense forests in India in the Permian period, 250 million years ago. A fossilized trunk of a tree found in the Raniganj coal-field is nearly 30 m long and 75 cm in diameter at the butt-end and 35 cm at the top-end. It has been named by Dr. Birbal Sahni as Dadoxylon, an extinct genus of plants. Fossil wood is found in several places in Madhya Pradesh and in the Siwalik hills along the Himalayas. Man was evolved in the beginning of Pleistocene Age, only