The Chay River is the second largest tributary of the Lo River. It originates from Ha Tao and passes in the western slope of the Tay Con Linh mountain range that has a peak height of 2,419 m, in the Hoang Su Phi district, Ha Giang province.
The river flows towards to the west in the upstream, to the southeast in the middle and lower reaches and finally enters the Lo River at Doan Hung.
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