Canyon of the Bibei Nature · O Bolo, Valdeorras, Ourense Image of O Bolo, not of the place itself. The River Bibei cuts its course into a deep gorge that marks the western limit of a municipality of 91 square kilometres lying between that river and the Xares, with ground rising to 1,200 metres at the Fraga da Ramalla. Photo: isol (CC BY-SA 3.0) What to see and do in O Bolo