Castro de Gaviotas (Gull's fort) karst limestone rock archway, and La Canalina bay, near Llanes, Asturias, Spain, Europe

travel destination photography color image horizontal day outdoors landscape landscapes scenics coast coasts cliffs rock cliffs coastal features eroded erosion nature natural world topography natural arches rock arch rock arches rocks rocky rock formations castro de gaviotas limestone la canalina asturias spain europe surface processes physical geography geology