low angle perspective of gravel and stones on floodplain in maas river

belgium alluvial border concept conservation country countryside dutch ecology ecosystem environment europe floodplain forest frontier green ground holland horizon lake land landscape meadow meuse nature outdoor park reserve reservoir river riverbank riverside rural scenic season shore spring stream summer tourism travel tree valley vegetation view water watercourse waterway wilderness low angle perspective gravel stones maas belgian trees background sunny day blue sky maasvallei meers elsloo netherlands