Sankosh (also Puna Thsang Chu, and Svarnakosha) is a river that rises in northern Bhutan and empties into the Brahmaputra in the state of Assam in India.

In Bhutan, it is known as the Puna Tsang Chu below the confluences of several tributaries near the town of Wangdue Phodrang.

The upper reaches of the Pho Chhu are susceptible to ice blockages, and the dzong has been damaged on several occasions by glacial lake outburst floods.

At Wangdue Phodrang, elevation 1,364 metres (4,475 ft), the river is joined by the west flowing Tang Chuu and it enters a precipitous gorge.

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