Thac Ba Lake is a large artificial lake located in Yen Bai Province, Vietnam. Created in the 1970s by the construction of the Thac Ba Hydropower Plant, it covers an area of approximately 23,400 hectares and features over 1,300 islands and islets. The lake is surrounded by lush green mountains and is known for its stunning natural beauty. The lake serves as an important resource for local communities, providing water for agriculture and fishing. It is also a popular destination for tourists, who come to enjoy activities such as boating, kayaking, and exploring the scenic landscapes.