YEN BAI PROVINCE Square: 6899,5 km 2 . Population: 746,4 thousand people (2010) City: Yen Bai City. Districts : Luc Yen, Van Yen, Mu Cang Chai, Tran Yen, Yen Binh, Van Chan, Tram Tau. OVERVIEW Yen Bai has artificial Thac Ba Lake, a scenic spot as well as a historical place. The lake consists of 1,331 hill-islands, varies vegetation cover and a diverse ecological setting. In the middle of the lake stands the Mong Son Grotto, home of the Yen Bai Party Committee during...