Final answer:
The Sobrandinho Reservoir, the largest reservoir formed by the Sao Francisco River, is located in Brazil, which is also notable for its large rivers and water resources.
Step-by-step explanation:
The Sobrandinho Reservoir, which is the largest body of water formed by the Sao Francisco River, is located in Brazil. Brazil is known for its vast rivers and significant water resources.
The Sao Francisco River, notable for its economic and cultural importance, flows through southeast Brazil and contributes to the country's diverse ecosystems and hydroelectric energy production.
The Sobrandinho Reservoir itself is utilized for multiple purposes, including electricity generation and water supply for irrigation.