Mahottari District, a part of Madhesh Province, is one of the seventy-seven districts of Nepal. The district, with Jaleshwar as its district headquarter, covers an area of 1,002 km2 (387 sq mi) and had a population of 553,481 in 2001, 627,580 in 2011 and 705,838 in 2021 census. Its headquarters is located in Jaleshwar, a neighbouring town of the historical city of Janakpur. The name Jaleshwar means the 'God in Water'. One can find a famous temple of Lord Shiva in Water there. Jaleshwar lies at a few kilometres distance from the Nepal-India border and has a majority Maithili population.

Madhesh Province is a province of Nepal in the Terai region with an area of 9,661 km2 (3,730 sq mi) covering about 6.5% of the country's total area. It has a population of 6,126,288 as per the 2021 Nepal census, making it Nepal's most densely populated province and the smallest province by area. It borders Koshi Pradesh to the east and the north, Bagmati Province to the north, and India’s Bihar state to the south and the west. The border between Chitwan National Park and Parsa National Park acts as the provincial boundary in the west, and the Kosi River forms the provincial border in the east. The province includes eight districts, from Parsa in the west to Saptari in the east.