The Languedoc-Roussillon is a former administrative region of France, which was merged with the region Midi-Pyrénées in 2016. The changes were intended to have less administrative regions, which is basically a simplification of bureaucracy. In other words it’s not very helpful for our purposes, as we try to find recognizable regions, which are commonly used in guidebooks and on maps, and are nevertheless helpful from the geological point of view. As a result, we added the new merged Occitanie region, but subdivided it into helpful subunits.
So this page about Languedoc-Roussillon is neither the old region nor an actually existing region, it is the geographic unit of the mediterranean plains and the foothills of the karst plateaus between the Rhone Valley and the border to Spain. This geographic unit is more ore less congruent with the former region Languedoc-Roussillon.