São Francisco River Flowing into Sobradinho Reservoir, Brazil9.4S 40.8W
The artificial lake known as the Sobradinho Reservoir, created by the dam of the same name, in the Brazilian state of Bahia, can be seen at the top center. The São Francisco River flows vertically from south to north through the middle of the image, into the lake.
The river, which both the reservoir’s primary inflow and outflow, empties golden sediments into the southern reaches of the lake. As these mix with the waters of the 320 km long and (on average) 8.6m deep reservoir, the water color changes from golden to green to dark blue.