Lençóis Maranhenses is a unique national park located in the state of Maranhão, Brazil. It is famous for its vast expanse of white sand dunes that stretch over 1,500 square kilometers. The park features seasonal rainwater lagoons that form between the dunes, creating stunning blue and green pools during the rainy season. The best time to visit Lençóis Maranhenses is from May to September when the lagoons are full. The park is home to diverse wildlife and offers various activities, including hiking, swimming, and photography. Its breathtaking landscapes attract nature lovers and adventure seekers from around the world.