amazing large hole like an arched window in the clifftop. erosion.

breach calcareous cavity clayey cliff cliffside clifftop coast crag crest crevice eroded erosion face fissure formation geological geology hole indented italian italy jagged jaggy limestone mountain mountaintop natural nature nesting opening outcrop overhang overhanging palinuro passage peak pothole ridge rock rocky rough sharp sheer steep stone stony summit weathered weathering weatherworn