Eder basin

tributary river of the Fulda in Germany

The Edersee (), also known as the Ederstausee, is an reservoir in Waldeck-Frankenberg, Hesse, Germany holding back an estimated . It has the second-largest area (behind the Forggensee), and the third-largest volume (behind the Bleilochstausee and Rurstausee), of all reservoirs in Germany. It is on the chief western tributary of the Fulda, the Eder, behind the Edersee Dam near the town of Waldeck in the Waldeck-Frankenberg district of North Hesse.