The Eisbach, locally known as , is a long river and left or western tributary of the Rhine in the northeastern Palatinate and southeastern Rhenish Hesse, in the German state of Rhineland-Palatinate. Course The largest of the seven springs of the Eisbach is at an elevation of about above sea level on the northern slope of the Hohe Bühl mountain, , in the northern Palatinate Forest, southwest of Ramsen. After about two kilometres, the seven streams unite in the Eiswoog reservoir. At the hamlet of Kleehof, the long Bockbach flows in from the right. Here, the direction of the river changes from straight north to northeast. The direction remains northeast until the confluence with the Rhine. The river then flows past Ramsen and Eisenberg. Below Ebertsheim, it receives the long Seltenbach from the right and a few metres further, its largest tributary, the Rodenbach from the left. At Asselheim, a ward of Grünstadt, the Eisbach reaches the Upper Rhine Valley. It then flows through the wards of Albsheim, Mühlheim and Colgenstein, then Obrigheim itself and finally the hamlet of Neuoffstein. Here, it receives up to per work day of waste water from the sugar beet processing plant Südzucker-Werk Offstein. At Offstein, it crosses the border into Rhenish Hesse. It then flows past some southwestern and southern wards of Worms, viz. Heppenheim, Horchheim and Weinsheim. Near State Road 523, the Mariamünsterbach branches off. During the middle ages, this stream provided the tanning and dyeing industries in Worms with water; in the 19th century it was covered. From this point onwards, the Eisbach is called Altbach ("old brook") and flows south of the Worms city centre, through the Bürgerweide ward. It flows into the Upper Rhine at the southern tip of the Worms marina, at an elevation of . History Etymology research suggests that the syllable Eis in the name of the Eisbach did not refer to the frozen state of water, but was derived Eisen ("iron"), referring to the iron ore that was formerly mined in this region. The name of the town of Eisenberg on the river appears to have the same meaning. The middle of the Eisbach valley was already being exploited in the Old Stone Age by ice age hunters and gatherers. This is evinced by stone tools from the Middle Stone Age that were discovered in Asselheim. Other finds from Asselheim date to the Late Stone Age