boulder cloud colorado cumulus debris hike hiker hiking landscape mountain mountains natural nature path range rock rocky rugged sky track trail Trek usa view walk blue dwindle edge high icy July margin melt norway norwegian plants plateau retreat snow thick vegetation white coast coastline distance distant island islands isthmus land Maddalena mediterranean pink rough Sardinia sea shore shoreline spit canada craggy far height jasper panorama peak river Rockies Rocky Mountains summit valley aquamarine bay energetic energy fierce inlet Maddalena Islands powerful strong summer tide wave