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In a karstic country cut by a canyon in which runs an allogenic river, there are several base levels (karstic, f1uvial...); chiefly if the limestones develop greatly under the bottom of lhe gorge. The difficulty of characterizing them appears in all the definitions given. From the example of the three most important canyons of the Eastern Bas Languedoc (South-Easl of France) and with the different geological controls (s.l.) one ascertain that at present: a) When an allogenic and surface river is perennal without important loss, lhere is a total connexion bel ween fluvial level and karstic base level. b) When an allogenic and temporary surface river doesn't flow and has losses, there is no conn,'xion between the major fluvial and base level and the karslic base level.

Niveaux de base actuels dans les principaux canyons du Languedoc oriental et des Plans de provence