GR 123: Plentzia and Gorliz Coastal Loop

This route is rated as difficult, requiring very good fitness levels, sure-footedness, and sturdy shoes. While some sections are easily accessible, the overall length (18.2 km) and elevation gain (630 m) make it challenging. It's not ideal for beginners seeking an easy stroll, but experienced hikers will find it rewarding.

The terrain is varied, featuring a mix of surfaces. You'll encounter significant portions of unpaved (7.64 km) and natural (1.06 km) paths, along with some paved (2.15 km) and asphalt (1.20 km) sections. There's also a small amount of gravel. Be prepared for potentially muddy and slippery conditions on unpaved sections, especially around Kukullu, if it has rained recently.

The route offers diverse scenery and historical sites. Key highlights include the View of Plentzia Bay from Astondo, the Ruins of Askorriaga Fortress, the modern Gorliz Lighthouse (the highest altitude lighthouse in Euskadi), and the Gorliz Coastal Bunkers. You'll also pass the Ermua Geodetic Point and Viewpoint and the Gaztelumendi Viewpoint, both offering expansive coastal views.

While specific parking areas aren't detailed, Plentzia, being the starting and ending point, offers various parking options within the town. It's advisable to look for public parking near the town center or along the bay, keeping in mind that it can get busy, especially during peak season.

Plentzia is accessible by public transport. You can typically reach Plentzia via metro or bus services from Bilbao, which is well-connected to the region. Check local transport schedules for the most up-to-date information on routes and timings to Plentzia.

The Cantabrian coast can be enjoyed year-round, but spring (April-June) and autumn (September-October) generally offer the most pleasant weather for hiking, with milder temperatures and less chance of extreme heat or heavy rain. Summer can be warm, and winter might bring cooler, wetter conditions, potentially making unpaved sections muddier.

Generally, coastal trails in this region are dog-friendly, but it's always recommended to keep dogs on a leash, especially near cliffs, livestock, or in more populated areas. Be mindful of other hikers and local regulations. Ensure you carry enough water for your dog, as water sources on the trail may be limited.

No, there are no specific permits or entrance fees required to hike this trail. It is a public access route along the coast and through natural areas.

Given the trail's difficulty and varied terrain, essential gear includes sturdy hiking boots with good ankle support, appropriate clothing layers for changing weather, rain gear, plenty of water, snacks, a map or GPS device, and sun protection. Trekking poles can be helpful on steeper or slippery sections.

The estimated duration for completing this 18.2 km circular hike is approximately 5 hours and 36 minutes. However, this can vary depending on your fitness level, the number of stops you make for photos or breaks, and weather conditions.

Yes, the route intersects with and follows sections of several official trails, including the Bizkaiko bira (71% of the route), and various segments of the Gr123.