Athabasca boulder canada current deluge drop falls fierce flow landscape natural nature plunge pour river rock Rockies Rocky Mountains torrent turmoil water waterfall beach cliff coastline Cornish cornwall England english Great Britain low tide ocean sand sandy sea shore surf waves boulders countryside exercise footpath green hike hillside mountain norway norwegian path snow track trail walk wild blue footprints holiday horizon Lofoten Islands rocks summer tide vacation wave coast distance distant island islands isthmus land Maddalena mediterranean pink rocky Sardinia shoreline spit view Balearic Islands cloud crags hard harsh majorca mountains ridge sky Spain tree valley wilderness