UHE FURNAS Dam, Brazil (IMAGE) Cary Institute of Ecosystem Studies Caption Located on the middle of the Rio Grande, the UHE FURNAS reservoir is one of the largest in Brazil. It impounds the Grande River and has a capacity of 22,590,000,000 m3 and a surface area of 1,473 km2. Credit Fábio Roland Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.