The Vaal Dam in South Africa was constructed in 1938 and lies 77 km south of OR Tambo International Airport. The lake behind the dam wall has a surface area of about 321 square kilometres (120 sq mi) and is 47 meters deep at deepest point . The Vaal Dam lies on the Vaal River, which is one of South Africa's strongest-flowing rivers. Other rivers flowing into the dam are the Wilge River, Klip River, Molspruit and Grootspruit. It has over 800 kilometres (500 mi) of shoreline and is South Africa's second biggest dam by area and the fourth largest by volume.
The Vaal Dam has a catchment area covering 38 505 square kilometres and a capacity to hold 2575 million cubic metres of water which, under normal circumstances and without a substantial inflow, will last for 2 years. This dam has a surface area of 321 square kilometres and an average depth of 22,5 metres.
The above catchment area is home to thousands of birds (the Fish Eagle recently come home), Duiker, Many cats, Jackals, insects, The famous bull frog and many thousands of others species.