Rapti (राप्ती) is a mid-western anchal (first-order administrative district, usually translated as 'region') of Nepal. It is divided into 5 jilla (districts):
The headquarters of Rapti is Tulsipur (Dang), and the largest city is Tribhuvannagar (Ghorahi). Other main cities and towns of Rapti zoon are Tulsipur, Bijuwar, Liwang, Lamahi, Musikot and Chaurajhari etc.
Dang district comprises the inner Terai valleys Deukhuri and Dang plus parts of adjacent mountain ranges. Here the Siwalak range rising to about 600 meters splits into two sub-ranges. The southern Dundwa Range begins a few kilometers north of Nepal-India border and separates the Deukhuri Valley from the Gangeatic Plains. The northern Dang Range then separates the Deukhuri and Dang Valleys. The 2,000 meter Mahabharat Range borders the Dang Valley on the north. Nepal's densely populated "Middle Hills" begin along the crest of the Mahabharat Range.
The (West) Rapti River flows the length of Deukhuri Valley after emerging from a gorge through the Mahabharat Range, eventually joining the Karnali River near Gorakhpur, India. Dang Valley is drained by the Babai river, another Karnali tributary.
Until a few decades ago the Dang and Deukhuri Valleys were malarial and virtually uninhabitable except to the Tharu ethnic group who seem to have evolved a degree of resistance. The government began using DDT to suppress the mosquito vectors, thus this relatively level, fertile and well-watered land became useful to settlers from the hills.
Pyuthan, Rolpa and Salyan districts are situated in and north of the Mahabharat Range, in the so-called middle hills. Pyuthan district has extensive irrigated rice growing areas inhabited by Brahman-Chetri and Newar castes along Jimruk Khola, a major upper tributary of the (West) Rapti River. Rolpa district mainly lies along Madi Khola, the other major upper Rapti tributary that is more eroded into an inner gorge and less useful for irrigation.
Pyuthan and Rolpa districts extend north to rugged 3-4,000 meter ranges where Madi Khola and Jimruk Khola rise. Kham Magars live in small villages throughout these highlands up to about 2,500 meters. Since agriculture is difficult away from lowland streams, they also herd sheep, goats and cattle and sell butter, grow subtropical and temperate fruit such as citrus and Asian pear, and migrate in search of employment. They also made hashish from hemp that grows wild in cloud forests at about 3,000 meters until the government got out of this business in the 1970s.
Salyan district is similar to Pyuthan in having a mix of rice-growing lowlands inhabited by caste Hindus, and uplands inhabited by Kham peoples.
Rukum is the northernmost district of Rapti Zone. It lies north of the Rapti basin, from the easternmost tributaries of the Bheri up to the southern slopes of Dhaulagiri Himal. It is sparsely populated but used by Kham herdsmen in summer. There is a settlement of Tibetan Refugees at Dhorpatan in the valley of the so-called Uttar Ganga, a Bheri tributary.
Link with www.wikipedia.com