Lục Yên is a rural district of Yên Bái province, in the Northeast region of Vietnam. As of 2019, the district had a population of 108,817. The dis…Lục Yên is a rural district of Yên Bái province, in the Northeast region of Vietnam. As of 2019, the district had a population of 108,817. The district covers an area of 811 km. The district capital lies at Yên Thế. Numerous quarries in the district produce gemstones such as rubies, spinel, and tourmaline.