The main ridge of the Taunus (German: Taunushauptkamm) refers to a 75-kilometre-long ridgeline in the High Taunus mountain in Germany, whose geological core consists of veins of hard and which separates the steeply descending Anterior Taunus to the south from the more gradually descending upland of the Hintertaunus or Farther Taunus in the north. The watershed between the Upper Rhine and River Main to the south and the Middle Rhine tributaries of the Wisper and Lahn to the north, runs for long sections along the main ridge. Several of the river flowing southwards have broken through the rock of the Taunus ridge unit in several places so that the watershed is diverted a few kilometres to the north.