Kailali District, a part of Sudurpashchim Province in Terai plain, is one of the 77 districts of Nepal. The district, with Dhangadhi as its district headquarters, covers an area of 3,235 square kilometres (1,249 sq mi) and has a population 911,155 and, .

Sudurpashchim Province is one of the seven provinces established by the new constitution of Nepal which was adopted on 20 September 2015. It borders the Tibet Autonomous Region of China to the north, Karnali Province and Lumbini Province to the east, and India's states of Uttarakhand and Uttar Pradesh to the west and south, respectively. The province covers an area of 19,539 km2, or about 13.22% of the country's total area.