There are four major rivers in this district that flow into India: the
Bagmati & Manushmara river "(sisaut)" the Hardi (Banke), the
Lakhandei and the Jhim. However, there are around a dozen other small rivulets that originate from the Chure hills and flow down the plain. They are actually the tributaries of the three major river systems of the district. These small rivulets are the Hariwan khola, the Dhungre khola, the Soti khola, the Sotraha khola, the Chapini khola, the Pathlaiya khola, he Kalinjor khola, the Phooljor khola and the Banke Khola. The Banke Khola is the eastern demarcation of the district separating it from Mahottari district, whereas the
Bagmati river flows between Sarlahi and Rautahat districts. • Bagmati river system: it is the largest river, flowing in the western side of district separating
Rautahat district from Sarlahi. •
Lakhandei river system: this river is the largest river inside the district; it is about 25 kilometers long. It originates from the Chure Mountain range, the lowest foothills of the Great Himalayan ranges. It flows into India by touching
Simara village development committee (VDC) of this district. •
Jhim river system: originating from the northeast side of the Chure mountains of this district into the Phuljor and Kalinjor rivers, it joins at the Vairawpur village of
Jabdi VDC, then it becomes Jhim river. It is long and by flowing into districts passes into India, and in India this river is known as
Adhwara river. Adhwara river was the east border of
Makwanpur region.
Banke (Hardi Nadi) river. Banke river was the east border of Sarlhi district. There are also many rivers in this district including the Adhwara River of the east which empties into the Jhim River,
Manushmara river (which is formed by mixing Harion, Sotara and Pathlaiya rivers), and in middle of the district Dhangra and Bhumi rivers. •
Bhatauliya river system: this river is the medium river inside the district; it is about 10 kilometers long. It originates from the Soram range. It flows into India by touching
Bhatauliya VDC of this district. ==Demographics==