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(Black River, Songbo), a river in China and the Democratic Republic of Vietnam; a right tributary and the largest tributary of the Hong River. The Da River is about 1,000 km long. Its source is in the Yunnan highlands, from which it flows primarily through a deep valley from northwest to southeast. The river overflows its banks during the monsoons of summer and fall. Rice is grown in its lower basin. The city of Hoa-binh (Democratic Republic of Vietnam) is on the Da.