The Camino Natural del Ebro (GR-99), is a long distance trail (GR in Spanish). It starts at the source of the river Ebro in Fontibre (Cantabria) and it follows the river all the way to the end at Deltebre (Tarragona), 1,280 km later. The trail crosses the provinces of Cantabria, Palencia, Burgos, Álava, La Rioja, Navarra, Zaragoza and Tarragona.
The trail is well-signposted with red and white color-coded markers. It is divided into 42 manageable stages each of which can be completed in a day.
At the start of each stage there are information boards which include route descriptions and visitors’ information about local wildlife and cultural heritage. The boards are displayed at the sites of landmarks in the area.
The trail’s width is between 1 and 4 metres, depending on the ground. But most of the route involves pathways 2-3 metres wide. Generally the tread surface is compacted dirt.