OK, so a
roubine can be a gulley or watercourse, and this is indeed the def. in Brunet's Les Mots de la Géographie : "
roubine Occitan: ravine; s'étend aux canaux des marais".
Larousse Lexis, on the other hand, gives : "
ROUBINE ...(mot prov.)
Dialect. Dans le Midi, ENSEMBLE DE RAVINEMENTS [mes majuscules] dans les roches tendres (syn. BAD LANDS)"
Interestingly, le Dictionnaire des Sciences de la Terre by Michel & Fairbridge gives
RouGines provençales as "badlands".
While a
roubine can be an individual gulley or watercourse, and number of these will logically be
roubines, in other contexts, where the plural
roubines as a whole is discussed, not any of the invididual watercourses/gulleys, then the word corresponds to what in North America are called "badlands"; not that this translation, or indeed any translation, is appropriate here.
Someone has given a web ref. here where you can see a map that indicates "Roubines Noires" which I take to refer to an extensive landform, not a series of individual gulleys.
See map here (bottom of page) :
http://aventuralpines.over-blog.com/article-6783408.html