Oasis is an isolated area of vegetation in a desert, typically surrounding a spring or similar water source. Oases also provide habitat for animals and even humans if the area is big enough.

This wonderful desert lake is set within Lençóis Maranhenses National Park, Maranhao, Brasil. It forms part of a system of fresh water lagoons which fill up with rainwater during the first six months of the year and then gradually evaporate over time to be topped up again the following year. Some of the lakes within the park are dotted with palm trees. This lonely lake, however, has one solitary dry branch decorating its banks.