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,
Geography of Arunachal Pradesh Patkoi Ranges. It is endowed with wide topographical variations, vegetation and wild life. The state is vivisected by rivers and streams, which originate in higher Himalayas and Arakan Ranges and flow down to form the tributaries of Brahmaputra. Arunachal Pradesh is primarily a hilly tract nestled in the foothills of Himalayas. Previously, Arunachal Pradesh had been a part of the North Eastern Frontier Agency. Today, Arunachal Pradesh is a state of the Indian Union. Due to the topographical diversity, the climate in Arunachal Pradesh ranges from sub-tropical to temperate depending upon the altitude.The regions in the lower belts of the