beach coast dry dunes ecology habitat hummock hump natural nature sand sea Spain blue cloud clouds dune grass sky sundland coastline colors colours conservation conserve conserving cultivating cultivation dune-flora environment environmental flora grasses green greenery growing growth ocean ocean edge planting plants protect protection reclaim reclamation replanting rough salt-resistant sand-dunes scrub vegetation change foothill hills Incredible India India Jammu Ladakh mountains rocks sand dune Soil terrain