Rapti zone's Salyan and Dang Deukhuri Districts border to the north and east.

To the south lies Uttar Pradesh, India, a country in Asia; specifically Shravasti and Bahraich districts of Awadh.

East of Nepalganj the international border follows the southern edge of the Dudhwa Range of the Siwaliks.

Rapti and Babai cross into Uttar Pradesh, a state in India, Nepal's neighboring country and eventually join the Karnali, whose name has changed to Ghaghara.

[4] Ethnicity/caste: 19.2% were Musalman, 15.8% Tharu, 14.5% Chhetri, 6.5% Hill Brahmin, 5.7% Magar, 4.7% Kami, 4.7% Yadav, 3.6% Thakuri, 2.2% Kurmi, 1.9% Chamar/Harijan/Ram, 1.5% other Dalit, 1.5% Damai/Dholi, 1.3% Newar, 1.1% Dhobi, 1.0% Kathabaniyan, 1.0% Sanyasi/Dasnami, 1.0% other Terai, 0.9% Dusadh/Pasawan/Pasi, 0.9% Hajam/Thakur, 0.9% Kori, 0.8% Terai Brahmin, 0.8% Gurung, 0.8% Teli, 0.7% Kanu, 0.6% Kayastha, 0.5% Halwai, 0.4% Badhaee, 0.4% Kahar, 0.4% Sarki, 0.3% Gaderi/Bhedihar, 0.3% Koiri/Kushwaha, 0.3% Kumal, 0.3% Kumhar, 0.3% Mallaha, 0.3% Marwadi, 0.2% Bengali, 0.2% Chidimar, 0.2% Kalwar, 0.2% Kewat, 0.2% Lohar, 0.2% Sonar, 0.2% Tamang, 0.1% Badi, 0.1% Baraee, 0.1% Gaine, 0.1% Lodh, 0.1% Mali, 0.1% Musahar, 0.1% Pattharkatta/Kushwadiya, 0.1% Rai, 0.1% Rajbanshi, 0.1% Rajput and 0.1% others.