Balearic Islands blue boulders cliff coastline dangerous harsh majorca mediterranean natural nature rocks rough rugged sea Spain spanish spray spume water waves white Athabasca boulder canada current deluge drop falls fierce flow landscape plunge pour river rock Rockies Rocky Mountains torrent turmoil waterfall Afsluitdijk cloud dike embankment holland Ijsselmeer lake levee light monument Netherlands rural sky summer tower Zuiderzee beach Cornish cornwall England english Great Britain low tide ocean sand sandy shore surf algae seaweed boat ferry green hillside island Pembrokeshire ship united kingdom view wales welsh boast coast color colour evening horizon orange sun sunset wave