International audienceSince 2008, gliders repeated transects crossing the basin of the North Western Mediterranean Sea and regularly sampled mesoscale structures with an high horizontal resolution of about 2-3 km between each profile required in that region of small internal deformation radius (<10km). By analysing more than 50 000 profiles collected by these gliders in the last 5 years, we were able to identify several types of eddies regarding the water mass composing their cores: Winter Intermediate Water (WIW), Levantine Intermediate Water (LIW), Western Mediterranean Deep Water (WMDW). Most of them are anticyclonic structures with Rossby Number greater than 0.1 and tend to be characterized by a core in the inner ocean. Some of them who...