dunes and lagoons of atins, lencois maranhenses, barreirinhas, brazil. white sand dunes with pools of fresh water

brazil barreirinhas atins dune lagoon lagoa maranhao lencois maranhenses dunes desert sand nature landscape travel tourism brazilian natural national park paradise adventure beach landscapes outdoor preguica boat river rio trip water tropical jungle ecotourism forest mandacaru landmark ferry crossing delta parnaiba port wildlife piau sloth lake dry sandy