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,
Birds of the Central Indian Highlands – August). The natural vegetation of the Central Indian Highlands is dominated by the peninsular sal ("Shorea robusta") forests in the east and teak ("Tectona grandis") forests in the west. Birdlife in Central Indian Highlands is generally not so rich as either Eastern Himalayas or the Western Ghats although they have been suggested to have acted as an important dispersal highway in the historical past for the Indo-Malayan elements from the Eastern Himalayas to Western Ghats and Sri Lanka (Ali, 1949). (See also Satpura hypothesis) About 430 species of birds have been reliably recorded from this region representing 61 families