Koshi Barrage

Koshi Barrage is a hydraulic control structure in Saptari District, Nepal, that extends 1,150 meters (3,773 feet) and uses 56 gates to regulate the river between Madhesh Province and Koshi Province. The concrete construction rests on massive pillars that absorb water pressure while the movable gates can be opened during high water.

Construction took place between 1958 and 1962 following the Koshi Agreement signed by Nepal and India in 1954. The structure was built to control recurring floods and supply water to agricultural areas.

The structure connects both riverbanks and serves as a popular spot for locals who walk along it to watch the river and passing boats. Fishermen dock here and sell their fresh catch directly on the shore while families meet in the small tea houses.

The structure can be reached on foot or by vehicle and offers a direct connection between Sunsari and Saptari districts. The best time to visit is during the cooler morning or evening hours as the region can become very hot during the day.

Between August and October, Siberian migratory birds use the area as a resting place on their way to warmer regions. During the same period, Gangetic dolphins move through the waters and can sometimes be spotted near the structure.