Pico Tres Mares

Pico Tres Mares is a mountain located on the border between Cantabria and Castile and León, standing at approximately 2,175 meters. The summit sits at the point where three major Spanish rivers—the Ebro, Duero, and Tajo—originate their drainage systems.

Ancient shepherd routes that cross this mountain region reveal a long history of movement across centuries. These historical paths remain visible in the terrain today and connected the valleys on both sides of the border.

The summit marks a regional boundary and serves as a recognizable landmark for hikers across the area. People come here to experience this geographical meeting point and take in views across multiple regions.

The climb to the summit is a straightforward hike with moderate elevation gain, accessible from the parking area at the end of road CA-916. The trail is clearly marked and typically takes a few hours depending on fitness level and weather conditions.

This is where three water systems split and direct flows in different directions—a place where Spanish hydrology converges. Few visitors notice that each raindrop falling here begins a different journey depending on which side of the peak it lands.