top-down view of the wooden boardwalk for walking across sand dunes in algarve

alvor promenade boardwalk dunes sand sands path aerial view trekking trail birdwatching bird watching golden hour grey portugal europe algarve outdoors travel vacations swamp meadow wooden bridge scenery ecotourism board walk hiking walking wildlife topdown top bushes shrubs desert deserted area shadows vegetation flowers footprints speps marks tracks top-down