Hoces del Río Riaza Natural Park

Hoces del Río Riaza Natural Park protects 5,145 hectares of river gorge in the northeastern corner of Segovia province, right up against the border with Burgos. Three villages sit within its boundaries — Maderuelo, Valdevacas de Montejo, and Montejo de la Vega de la Serrezuela — and it's from Maderuelo, perched above the reservoir, that most visitors set out to explore the canyon.

What does the landscape of the park look like?

The Riaza River runs from southeast to northwest, carving out three distinct stretches along the way. The first, between Maderuelo and the Linares del Arroyo dam, has gentler relief — the river has been dammed here since 1951, forming a long reservoir. Further on, over roughly 5.5 kilometers between the dam and the El Casuar stream, the river has cut deep into the limestone, creating a canyon up to 150 meters deep and 200 to 300 meters wide. These steep limestone cliffs are the heart of the park and its most striking feature.

Why is this park important for birds?

The park's greatest natural asset is its bird life, and above all its enormous griffon vulture colony — more than 150 breeding pairs nest on the ledges of the gorge, making it one of the largest colonies of the species in all of Europe. That alone makes the canyon a prime destination for raptor watching. Alongside the griffon vultures, the cracks and hollows of the cliffs shelter other species tied to this rocky habitat: the Egyptian vulture, the common kestrel, the crag martin, the red-billed chough, and the eagle owl, which hunts among the rock crevices at dusk.

What should you see when visiting Maderuelo?

The town of Maderuelo, picturesquely set on a promontory above the reservoir, is the natural starting point for exploring the canyon. Walking trails lead out from the area, letting visitors take in both the calmer, dammed stretch of the river and the wilder, rocky gorge further northwest. It's worth bringing binoculars — watching griffon vultures circle above the cliffs is one of the park's main draws, especially in the warmer months when the birds make the most of the thermal currents rising over the canyon.

Frequently asked questions

How large is Hoces del Río Riaza Natural Park? It covers 5,145 hectares in Segovia province, along the border with Burgos.

What does the Riaza river canyon look like? A limestone canyon up to 150 meters deep and 200–300 meters wide, formed over roughly 5.5 km between the Linares del Arroyo dam and the El Casuar stream.

What birds can you see in the park? Above all the griffon vulture (more than 150 breeding pairs, one of Europe's largest colonies), along with the Egyptian vulture, common kestrel, crag martin, red-billed chough, and eagle owl.

Which villages lie within the park? Maderuelo, Valdevacas de Montejo, and Montejo de la Vega de la Serrezuela.