The Tharu or Tharuhat languages are any of the Indo-Aryan languages spoken by the Tharu people of the Terai region in Nepal, and neighboring regions of Uttarakhand, Uttar Pradesh and Bihar in India.

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.