Gorges of the Pino Nature · Aller, Caudal, Asturias Image of Aller, not of the place itself. A gorge with almost vertical walls cut by the River Pino, with stretches less than six metres wide; its 76 hectares of beech wood, chestnut wood and high pasture were declared a natural monument on 19 April 2001. Photo: LBM1948 (CC BY-SA 4.0) What to see and do in Aller