boat trip on the preguica river from barreirinhas, lencois maranhenses to atins, maranhao, brazil

brazil preguica river delta barreirinhas lencois maranhenses boat maranhao rio trip water brazilian landscape tourism travel tropical nature jungle national ecotourism america park dunes forest mandacaru sand outdoor tree landmark ferry crossing santo antonio transport transportation parnaiba port wildlife blue lagoon beach piau sloth navigation mangroves lake atins