Saptari District (Nepali: सप्तरी जिल्ला Listen ), a part of Sagarmatha Zone, is one of the seventy-five districts of Nepal, a landlocked country in South Asia. The district, with Rajbiraj as its district headquarters, covers an area of 1,363 km² and has a population (2011) of 639,284 which makes 10th populated district of Nepal.