Thac Ba Reservoir is a large artificial lake located in Yen Bai Province, Vietnam. Created in 1971, it covers an area of approximately 23,400 hectares and is surrounded by lush green mountains. The reservoir is formed by the Thac Ba Hydropower Plant, which plays a crucial role in generating electricity for the region. The reservoir is not only important for energy production but also serves as a popular destination for tourism and recreation. Visitors can enjoy activities such as boating and fishing, while the scenic landscape offers opportunities for photography and relaxation amidst nature.