The Eder is a 177 km long river in Germany, and a tributary of the Fulda River. It was first mentioned by the Roman historian Tacitus as the Adrana in the territory of the Chatti. The river rises from the Ederkopf mountain in western North Rhine-Westphalia near the springs of the Lahn and Sieg rivers. Unlike the Lahn and Sieg, that are both tributaries of the Rhine, the Eder flows east and north and into the river Fulda at Edermünde, south of Kassel. At Hannoversch Münden, the Fulda j… (More on Eder)