Freshwater plants in rain water ponds in the middle of sand dunes, Lencois Maranhenses, Maranhao, Brazil, South America

underwater lencois maranhenses maranhao brazil rain ponds sand dunes pond dune beach rainwater fresh water freshwater shallow plants day outdoors landscape landscapes water surface surface level nature natural world botany leaves ponds south america lencois maranhenses national park parque nacional dos lencois maranhenses horizontal