越池市
Ba Vì has an area of 428.0 km2, the largest district of Hanoi, which includes two large lakes: Suối Hai Lake and Đồng Mô Lake (at Đồng Mô tourist area); both are artificial lakes being located in the watershed of the Tích River, which flows through Sơn Tây town and some western districts of Hanoi, which then flows into the Đáy river. Notably Ba Vì National Park is an important destination in the district. At the boundaries of the district and Phú Thọ province, there are two junctions: Trung Hà junction between the Đà River and the Red River (in Phong Vân) and the Bạch Hạc junction between the Red River and the Lô River (Tân Hồng and Phú Cường communes, opposite to Việt Trì city).