The Twiste is a river of Hesse and of North Rhine-Westphalia, Germany. It is the most important tributary of the Diemel, which it joins in Warburg. Its largest tributaries are the Erpe, Watter, Aar and Wande. The Twistesee reservoir, in the county of Waldeck-Frankenberg in North Hesse, impounds the Twiste. From Wikipedia