Puerta del Mar Interpretation Centre Monument · Soto del Barco, Avilés, Asturias Image of Soto del Barco, not of the place itself. At San Juan de la Arena it explains the two activities that made the village: fishing at the mouth of the Nalón and the coal that came down the river to the loading docks on the Asturian coast. Photo: Zato-ino at Asturian Wikipedia (CC BY-SA 3.0) What to see and do in Soto del Barco