Represa Billings is the largest reservoir in the state of São Paulo, Brazil, sprawling across 127 km² (49 square miles) at a surface elevation of 751 meters (2,464 feet) above sea level. Named after American hydroelectric engineer Asa White Kenney Billings, this massive impoundment was originally constructed beginning in 1925 to generate hydroelectric power for the city of São Paulo, reaching its maximum quota by 1950. The reservoir sits in the headwaters region of the Tietê River basin and spans multiple municipalities including Santo André, São Bernardo do Campo, Diadema, Ribeirão Pires, Rio Grande da Serra, and the city of São Paulo itself. With a perimeter of approximately 900 km and a total water volume of roughly 1,228.7 million cubic meters, Billings offers an enormous and varied fishery within striking distance of one of South America's largest metropolitan areas.