The largest artificial lake is:

Kariba is the biggest man-made lake in the world, located in the Kariba Gorge of the Zambezi River between Zambia and Zimbabwe. With a catchment area of 663,000 square kilometers and a surface area of 5,400 square kilometers, this dam can retain up to 180 cubic kilometers of water. The dam formed Lake Kariba, which is 97 meters below the water’s surface.