Thac Ba Lake is one of the largest artificial lakes in Vietnam. It is situated in Luc Yen and Yen Binh districts, Yen Bai Province, about 3-4 hour drive from Hanoi.
With the area of 23,400 ha, Thac Ba Lake includes 1,331 hill-islands, a varied vegetation cover and a diverse ecological setting. The water is blue and pure, reflecting the shade of the old woods surrounding the lake.
There are several caves in hill-islands on the lake such as Hum (Tiger) Cave, Cau Cuoi Cave, Bach Xa (White Snake) Cave, and Thac Ba Temple.
In 1285, this area witnessed a battle in which General Tran Nhat Duat defeated Yuan-Mongolian invaders. In Upper Lake, there remain several vestiges of the offices of Central agencies in the anti-French resistance. In the middle of the lake stands Mong Son Cave which housed the Yen Bai Party Committee during the anti-American resistance.
Thac Ba Hydroelectric Power Plant is the first of its kind built in Vietnam.