autumn bracken cliffs clouds coastline Cornish cornwall England english Great Britain hills nature plants rocks sea sky vegetation water waves beach boulder chalk cliff Devon erosion February gravel rock shingle shore terrain beautiful beauty calm coast countryside Gower green landscape path peace quiet rural summer track tranquil wales architecture emergency harbour help landmark lifeboat rescue safety save service slipway station structure welsh cold freezing icy mountains natural norway norwegian plateau road shadow snow snowy trees white wild cloud altitude blue canada conifers forest height high lake mountain range Rockies Rocky Mountains rocky sand sandy tide