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is a river that rises in northern Bhutan
Bhutan , officially the Kingdom of Bhutan, is a landlocked state in South Asia, located at the eastern end of the Himalayas and bordered to the south, east and west by the Republic of India and to the north by the People's Republic of China...
and empties into the Brahmaputra in the state of Assam
Assam , also, rarely, Assam Valley and formerly the Assam Province , is a northeastern state of India and is one of the most culturally and geographically distinct regions of the country...
India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...
. In Bhutan, it is known as the Puna Tsang Chu
below the confluences of several tributaries near the town of Wangdue Phodrang
Wangdue Phodrang District is a dzongkhag of central Bhutan. This is also the name of the dzong which dominates the district, and the name of the small market town outside the gates of the dzong...
. The two largest tributaries are the Mo Chhu
Mo Chhu is a major river in Bhutan. The word "Chhu" means "river" or "water" in Dzongkha, the official national language in Bhutan. The river rises in Gasa Dzongkhag near the border between Bhutan and Tibet. From there, the Mo Chhu flows generally southward to Punakha in central Bhutan, where it...
and Pho Chhu, which flow together at Punakha
thumb|right|Punakha Dzong and the [[Mo Chhu]]Punakha is the administrative centre of Punakha dzongkhag, one of the 20 districts of Bhutan. Punakha was the capital of Bhutan and the seat of government until 1955, when the capital was moved to Thimphu. It is about 72 km away from Thimphu and it...
. The Punakha dzong, which is situated immediately above the confluence of the two rivers, is one of the most beautiful dzongs in Bhutan and the winter residence of the Central Monk Body. The upper reaches of the Pho Chhu are susceptible to ice blockages, and the dzong has been damaged on several occasions by glacial outburst floods (GLOF). At Wangdue Phodrang, (altitude 1364 m), the river is joined by the west flowing Dang Chhu and it enters a precipitous 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 confluence with the west flowing Hara Chhu. The last major Bhutanese tributary is the Daga Chhu.
- River System of Bhutan from "SURVEY OF THE WATERS OF BHUTAN PHYSIOGRAPHY AND FISHERIES POTENTIAL", FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS, 1978