Eastern South Asia region is bounded by Nepal, Sikkim, and Bhutan in the north, Bangladesh in the east, the Indian states of Uttar Pradesh and Chhattisgarh on the west, and the Indian state of Andhra Pradesh in the south. It is connected to the Seven Sister States of Northeast India by the narrow Siliguri Corridor. West Bengal is on the eastern bottleneck of India, stretching from the Himalayas in the north, to the Bay of Bengal in the south. The region lies in the humid-subtropical zone. The landlocked region of Northeast India includes the states of Assam, Arunachal Pradesh, Bihar, Mizoram, Manipur, Meghalaya,
Eastern Himalaya Eastern Himalaya ] The Eastern Himalayas, or Tropical Himalayas extend from the westernmost part of Kaligandaki Valley in central Nepal to northwest Yunnan in China, also encompassing Bhutan, North-East India (its northeastern states of Sikkim and the North Bengal hills, Arunachal pradesh, Nagaland and Manipur) southeastern Tibet, and parts of northern Myanmar. This region is widely considered a biodiversity hotspot, with notable biocultural diversity The Eastern Himalayas have a much more sophisticated geomorphic history and pervasive topographic features than the Central Himalayas. In the southwest of the Sub-Himalayas lies the Singalila Ridge, the western end of a group of uplands