Catamaran Near French Calanques Coast, Marseille Editorial Image

Catamaran, a multi-hulled watercraft featuring two parallel hulls of equal size, at anchor near the Marseille Calanques. Calanques along the Mediterranean coast are narrow, steep-walled inlets developed in limestone, dolomite, or other carbonate strata. They are steep-sided valleys formed within karstic regions either by fluvial erosion or the collapse of the roof of a cave that has been subsequently partially submerged by a rise in sea level.