Starting point of the Lieserpfad.
The Lieser rises in the Hocheifel, the highest part of the low mountain range Eifel. Their source is in Boxberg, a municipality in the district Vulkaneifel.
The Lieser flows in predominantly southern direction and mostly a few kilometers west parallel to the A 1. It runs through Daun, the county seat of the district Vulkaneifel, where it crosses the federal roads 257 and 421. Then she arrives in the district of Bernkastel-Wittlich. In it, she passes through Manderscheid, after which the right side of the north-northwest flowing flowing Kleine Kyll opens as the longest Lieser inflow. After that, the Lieser near Wittlich, the county seat of the district of Bernkastel-Wittlich, reaches the Wittlicher valley and breaks through the Moselle mountains.
Finally, the approximately flowing from the north Lieser flows at the community Lieser in the coming from the southwest Moselle.
The Lieser is a 73.6 km long, orografisch left-sided or northern tributary of the Moselle in Rhineland-Palatinate. Its catchment area covers 402.4 km ².