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Yen Bai Province
| 17°C, Wind SW at 6 km/h, 82% Humidity|Trấn Yên District Wikipedia
Trấn Yên is a rural district of Yên Bái Province, in the northeastern region of Vietnam.
As of 2003 the district had a population of 96,949. The district covers an area of 691 km². The district capital lies at Cổ Phúc.