altitude canada conifer forest green height high landscape lone mountain natural nature peak Rockies Rocky Mountains steep tree american glacier ice meltwater Mount Baker stream usa view water wood barrier boundary cloud drystone England farm fence field grass Great Britain hill meadow sky wall boulder colorado elevation Mount Evans panorama range road rock sign animal domesticated english mammal rural sheep wool agapanthus bulb flower madeira mountains plant plateau valley wild beach coast dune sand shore Sussex vegetation West Wittering bush ecology flora flowers habitat shrub soft Spain summer blue distance distant far shade shadow snow summit white