➤ It originates from Someshwar hills and flows parallel to river Gandak. It forms meanders in its course. It is known as Sikrahana in its upper reaches. Motihari town is frequently affected due to the spill of the Sikrahana river.
➤ The Burhi Gandak flows at the old course of the Gandak river, which was once shifted Westward from its present course, thus, it is known by this name.
➤ It has the same course as the Gandak river, from North West to South-East.
➤ It meets the Ganga near Khagaria. It is the fast flowing river of Bihar. The total length of this river in Bihar is 320 km.
➤ Its important tributaries are Harha, Kapan, Mason, Banaganga, Pandai, Maniyari, Karha, Kohaura, Urai, Telabe, Prasad and Tiur.