Located in the Guadiana river basin, the Enxoé reservoir, on the river of the same name, occupies approximately 785.22 hectares and has been classified as a protected public water reservoir.

The Guadiana area, north of Mértola, where the river narrows, and locals say you could cross from one bank to the other "in one leap." Wolves are also said to have frequently used this crossing. The "rapids," caused by the riverbanks compressing from 25 to 3 meters, are a key feature. Natural waterfalls are also common, the largest of which stands out at over 15 meters high. Access to the area is via a dirt road.

A water stream the flows to the Guadiana river, between Moura and Serpa, where the Serpa dam was built.