Which is the longest barrage?

Sukkar Barrage is the largest barrage of Pakistan. It was named as Lolyd Barrage after its completion in British Raj in 1932. Sukkar Barrage is on Indus River near city of Sukkar in Sindh Province.

Farakka Barrage is a barrage across the Ganges River, located in the Indian state of West Bengal, roughly 16.5 kilometres (10.3 mi) from the border with Bangladesh near Chapai Nawabganj District. Construction was started in 1961 and completed in 1975 at a cost of INR156.49 crore (US$26 million). Operations began on April 21, 1975. The barrage is about 2,240 metres (7,350 ft) long.[1] The feeder canal from the barrage to the Bhagirathi-Hooghly River is about 25 miles (40 km) long.[2]