parallel rock formations on sea shore in tidal zone of sea top view outdoors La Rasa Mareal flysch cliffs Basque Country Spain Europe

artificial atlantic basque bay beach beaches biscay cliffs coast coastal country deva eroded erosion europe flysch formations geologic geology gipuzkoa la mareal natural nature ocean outdoors parallel parallels rasa rock rocks rocky sakoneta sea shore spain steep stone stones stony tidal top view washed zone