Las Tres Marías Trail

The terrain is notably challenging, featuring dense forests, steep ascents, and river crossings. You can expect muddy and slippery conditions, with some sections so steep that you might find yourself grabbing onto roots. The ground can be soft with intertwining branches and roots, and some parts are narrow with drop-offs. Descending also presents challenges, often involving navigating rocks, roots, and ankle-deep river water.

While listed for jogging, the Las Tres Marías Trail is described as a difficult trekking and climbing route. It features sustained steep sections and challenging terrain. Experienced trail runners looking for a significant physical challenge might attempt it, but beginners or those expecting a typical running path should be aware of its arduous nature. It's more suited for fast hiking or very technical trail running.

The trail is a circular route starting from Casares de Arbás. Parking is typically available in or near the village, which serves as the trailhead. Specific parking areas are usually well-marked for visitors accessing the trail.

The trail offers beautiful and enchanting scenery, showcasing a pure, virgin forest. Key highlights include the View of Las Tres Marías, the Collada Gistreo (1,634 m), and the Pine Forest Near Collado de Gistreo. You'll also encounter multiple waterfalls and enjoy breathtaking views of lowland communities and distant islands from the peaks.

Yes, the route fully encompasses the Sendero de las Tres Marías. It also passes through significant sections of the Transcantábrica trail (covering about 48% of its length) and a small part of the Puente del Glcaciar trail (about 4%).

Given its location within the Reserva de la Biosfera del Alto Bernesga, dogs are generally permitted. However, due to the trail's difficult and rugged terrain, including steep sections and potential river crossings, it might be very challenging for some dogs. Always keep your dog on a leash and ensure they are fit enough for such a strenuous route.

The trail's conditions can vary significantly with seasons. While the research doesn't specify an ideal time, considering the muddy and slippery conditions mentioned, spring and autumn might offer pleasant temperatures but could also bring more rain. Summer would likely be drier but potentially hotter. Always check local weather conditions before you go, especially for a trail of this difficulty.

The Las Tres Marías Trail is located within the Reserva de la Biosfera del Alto Bernesga. Generally, there are no specific permits or entrance fees required for hiking or jogging on established trails within Spanish Biosphere Reserves. However, always respect local regulations, especially concerning wildlife and environmental protection.

For this difficult trail, even if attempting to jog, you should bring sturdy trail shoes with good grip, plenty of water, snacks, and appropriate layers of clothing. Trekking poles can be very helpful for stability on steep and slippery sections. A first-aid kit, navigation tools (like the komoot app), and a fully charged phone are also essential.

Casares de Arbás is a small village. While specific amenities like cafes or pubs aren't detailed, it's common for such villages in rural areas to have at least one local establishment where you can find refreshments or a meal. Accommodation options might also be available, but it's advisable to check in advance, especially during peak seasons.

The trail passes through a pure, virgin forest with thick vegetation, offering opportunities to observe abundant wildlife. You might encounter various bird species and other forest animals. The unique flora includes mossy trees and pitcher plants, especially near the summits.