cave cavern cliff coastline danger natural nature rocks sea tide wales water waves welsh autumn brown forest hill hillside Kinnoul Perth scotland steep trees wooded woodland Andalucia bluff landscape mountain outcrop rock rocky Spain tree beach coast current England gravel Lyme Regis mouth river shingle shore boulder canada conifer evergreen jagged mountains Rockies sharp wall wood Broadhaven broken collapsed eroded erosion layers sedimentary worn yellow blue carpet climb climber face flower flowers Ipomoea madeira morning glory