The Terai–Duar savanna and grasslands is a narrow lowland ecoregion at the base of the Himalayas, about 25 km (16 mi) wide, and a continuation of the Indo-Gangetic Plain in India, Nepal and Bhutan.

The grasslands of the Terai in Nepal are among the tallest in the world, and are maintained by silt deposited by the yearly monsoon floods.

In the hillier areas the dominant tree is sal (Shorea robusta), which can grow to a height of 45 m (148 ft).

[1] Notable are the large numbers of the endangered greater one-horned rhinoceros and Bengal tigers as well as Asian elephants, sloth bears, Indian leopards.

In Nepal's Chitwan National Park, more than 400 rhinos were sighted in 2008, and 125 adult tigers were recorded during a survey conducted from December 2009 to March 2010, which covered an area of 1,261 km2 (487 sq mi).

Endangered mammals found here include the wild water buffalo and the near-endemic hispid hare (Caprolagus hispidus).