Inner Terai Valleys of Nepal

The Inner Terai Valleys of Nepal comprise several elongated river valleys in the southern lowland Terai part of the country. These tropical valleys are enclosed by the Himalayan foothills, viz the Mahabharat Range and the Sivalik Hills farther south.

These valleys are part of the Terai-Duar savanna and grasslands ecoregion. They are filled up with coarse to fine alluvial sediments. The Chitwan Valley and the Dang and Deukhuri Valleys are some of the largest Inner Terai Valleys. Malaria was prevalent in this region until the late 1950s. Since its eradication, the area became a viable destination for large-scale migration of people from the hills who transformed the area from virgin forest and grassland to farmland.