Balearic Islands blue boulders cliff coastline dangerous harsh majorca mediterranean natural nature rocks rough rugged sea Spain spanish spray spume water waves white boulder Cornish cornwall durable enduring England english fern granite granitic Great Britain hard Michael mount national trust rock saint St. Michael's Mount stone Athabasca canada current deluge drop falls fierce flow landscape plunge pour river Rockies Rocky Mountains torrent turmoil waterfall beach low tide ocean sand sandy shore surf countryside exercise footpath green hike hillside mountain norway norwegian path snow track trail walk wild footprints holiday horizon Lofoten Islands summer tide vacation wave coast distance distant island islands isthmus land Maddalena pink rocky Sardinia shoreline spit view