Like most anyone who lives in the oases at the heart of Brazil’s Lençóis Maranhenses National Park, a sprawling field of bone-white sand dunes and cerulean lagoons, Cassio José França Souza can ...

Impermeable rock beneath the sand dunes traps water, forming thousands of stunning blue lagoons. We were arriving just as the rainy season was beginning, to capture the habitat coming to life.

The vast white sands of the Lencois Maranhenses desert meet with the Amazon rainforest in Brazil. This surreal landscape is ...

Visitors can swim in the ocean, or in a nearby lagoon if the ... fishing village on Brazil's northeast coast: Surrounded by mountainous dunes, the whole place is built on sand.