Picture of the Day 05/31/25 - Wikimedia Commons

Fresh water collecting in the valleys between sand dunes in the Lençóis Maranhenses National Park in Brazil. A layer of rock beneath the sand prevents the rain water from dissipating during the rainy season, resulting in a broad expanse of lagoons.

Julius Dadalti, CC BY-SA 4.0, via Wikimedia Commons. View source.