The destructive sea : digging of bays and coves in soft rocks (fissile shales), formation of narrow creeks in fissured rocks and shattered zones, individualization of capes made up of hard rocks (quartzites, dolerites, …).

The constructive sea : accumulation of blocks, pebbles, sand deposits…

Sea erosion, rock’s nature and structure contribute to the picturesque quality of this shoreline where capes and bays alternate.