Sankosh is a river, rising in northern Bhutan and empties into the Brahmaputra in the state of Assam in India. In Bhutan, it is known as the Puna Tsang Chhu below the converging point of several tributaries near the town of Wangdue Phodrang. The two largest tributaries of Sankosh River are the Mo Chhu and Pho Chhu. These rivers flow together at Punakha. The Punakha dzong is situated just above the convergence of the two rivers is one of the most beautiful dzongs in Bhutan and the winter residence of the Central Monk Body. The upper courses of the Pho Chhu are prone to ice blockages, and glacial outburst floods have damaged the dzong on several occasions. At Wangdue Phodrang, where the altitude is 1364 m, the river is joined by the west flowing Dang Chhu and it enters a steep gorge. The highway running south from Wangdue Phodrang to Dagana follows the river for much of its course. Near the town of Takshay is the convergence point with the west flowing Hara Chhu. The last chief Bhutanese tributary is the Daga Chhu.

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