Pico de Urbión and the Source of the Duero River Loop

Popular starting points for this route include the Laguna Negra itself, or the "bunker" parking area near Castroviejo and Duruelo de la Sierra. The "bunker" parking offers convenient access to the source of the Duero River and the ascent to Pico de Urbión.

This trail is generally considered moderate to hard. While some sections, particularly from the "bunker" parking towards the Duero source, are moderate, the ascent to Pico de Urbión is a constant and strenuous climb. It requires very good physical fitness, sure-footedness, sturdy shoes, and some alpine experience for certain parts.

You'll encounter a diverse and rugged landscape. The trail passes through dense forests of Scots pine and beech, transitions to high mountain pastures, and features rocky formations. Expect unpaved paths, alpine hiking paths, and mountain hiking paths, all shaped by impressive glacial erosion.

The route showcases several stunning features, including the mysterious Laguna Negra, Laguna Larga, Laguna Helada, and Laguna de Urbión. You'll also visit prominent peaks like Picacho del Camperón (2,101 m) and Pico de Urbión, and the significant Nacimiento del Río Duero, where the Duero River begins its journey.

Generally, dogs are allowed on trails within the Parque Natural Laguna Negra y Circos Glaciares de Urbión. However, it's always recommended to keep them on a leash, especially in areas with wildlife or near livestock, and to check for any specific local regulations or seasonal restrictions before your visit.

There is typically no entrance fee to access the Parque Natural Laguna Negra y Circos Glaciares de Urbión itself. However, during peak seasons, there might be fees for parking or shuttle services to access popular areas like Laguna Negra. Always check local regulations before your visit.

The best time to hike this trail is generally from late spring to early autumn (May to October). During these months, the weather is more stable, and snow has usually melted from the higher elevations. Winter hiking is possible but requires specialist equipment and experience due to snow and ice conditions.

Yes, this route incorporates sections of several other trails. You will find yourself on parts of the Etapa 01: Fuentes del Duero – Vinuesa, the Valle de Urbión, Covaleda-Pico urbión, Sendero del Portilla, and the Sendero del Valle de Urbión.

Yes, the route passes by El Búnker Shelter, which can offer a basic refuge during your hike.

Given the trail's moderate to hard difficulty and varied terrain, you should bring sturdy hiking boots, appropriate layers of clothing for changing mountain weather, plenty of water and snacks, a map and compass or GPS device, and sun protection. Trekking poles can also be very helpful, especially on descents.

Absolutely. From Pico de Urbión (2,228 meters), the highest point in the Sierra de Urbión, you are rewarded with spectacular panoramic views of the surrounding mountains, glacial cirques, and the vast landscape of Soria province.