Walkways of the Vero River Nature · Alquézar, Somontano de Barbastro, Huesca Hiking route that runs through the gorge carved by the Vero River as it passes through Alquézar (Somontano de Barbastro), with wooden walkways suspended over the water, one of the most famous in Somontano. The Vero rises in the eastern foothills of the Sierra de Guara and enters the Sierra y los Cañones de Guara natural park near Sarsa de Surta; in its first few kilometres, the river and its tributaries have carved out some of the park's most representative limestone canyons, karst features that the route allows visitors to explore closely before the river flows out through Alquézar. Photo: McBodes (CC BY 3.0) What to see and do in Alquézar