Terai

The Terai is a belt of marshy grasslands, savannas, and forests located south of the outer foothills of the Himalaya, the Siwalik Hills, and north of the Indo-Gangetic Plain of the Ganges, Brahmaputra and their tributaries. The Terai belongs to the Terai-Duar savanna and grasslands ecoregion. In northern India, the Terai spreads eastward from the Yamuna River across Himachal Pradesh, Haryana, Uttarakhand, Uttar Pradesh and Bihar. Corresponding parts of West Bengal, Bangladesh, Bhutan and Assam east to the Brahmaputra River are called Dooars. The lowland plains of the Terai lie at an altitude of between 67 and 300 m (220 and 980 ft). North of the Terai rises the Bhabhar, a narrow but continuous belt of forest about 8–12 km (5.0–7.5 mi) wide.

Read more about Terai:  Etymology, Geology, Climate, Terai in Nepal, Terai in India