The area is home to one of the most significant populations of the Pyrenean desman, a rare semi-aquatic mammal, within the Madrid region.
The site functions as a natural water filtration zone for the Lozoya River before it enters the Pinilla Reservoir.
The valley contains specific soil compositions resulting from the erosion of the surrounding granite formations of the Sierra de Guadarrama.
It is a key habitat for the European pond turtle, which is frequently spotted in the calmer eddies of the river.
The site was historically part of traditional transhumance routes used by shepherds moving livestock between the plateau and mountain pastures.
Hoya Encavera is a natural area located near the reservoir of Pinilla in the Lozoya Valley of the Sierra de Guadarrama. The landscape is defined by its riparian forest, characterized primarily by ancient black poplars and various willow species growing along the banks of the Lozoya River. It serves as a significant stopover point for migratory bird species due to its position within a protected wetland corridor. The area features a marked riverside trail that facilitates navigation through dense woodland and meadow clearings. Its geomorphology consists of a depressed basin that collects runoff from the surrounding mountain slopes, creating distinct microclimatic conditions. The site is a popular location for birdwatching and low-impact hiking, offering views of the Sierra Norte mountain range. It is managed to balance public access with the preservation of native aquatic ecosystems.
The wooden bridge crossing the narrowest section of the river, offering a symmetry of the forest canopy reflected in the water.
Bring binoculars as the dense vegetation makes spotting bird life difficult from the main path.
Wear waterproof footwear, as the riverbank trails are prone to mud even during dry spells.
Stick strictly to marked trails to avoid damaging the sensitive riverbed ecosystem.
Do not attempt to walk off-trail during the spring flood season, as ground saturation can be deceptive.
Access may be restricted during periods of high fire risk in summer or extreme flooding in late winter.
No swimming or fishing allowed in protected sections; silence is requested to avoid disturbing wildlife.
