Colonies of griffon vultures flying over the cliffs, sheer rock faces where birds nest, a river with clean and fresh water that cuts through the narrow and changeable rocks, the remains of a bridge that (according to legend) was built with the help of the Devil, two tunnels through which the first electric train in Spain (the Irati) used to run. The result is a wildlife and harsh landscape that you'll enjoy if you visit the foz de Lumbier, a narrow gorge cut by the river Irati that has been declared a Nature Reserve. Its spectacular rock faces, isolated for centuries, have led to the conservation of singular vegetation covering the steep rock outcrops that are the nesting grounds for large birds of prey. An unequalled spectacle of reddish walls, from whose cracks trees and bushes hang and serve as nests for the birds. What makes this gorge so singular is that its 1,300 metres can be walked along a signposted path that runs along the river at the foot of the cliffs, which announce the first foothills of the Pyrenees in the east of Navarre. Listen to the ripple of the water and the shouts of choughs while you admire the beauty of this natural enclave.