Tower of el Señorío de Marentes Monument · Ibias, Narcea, Asturias Image of Ibias, not of the place itself. The locals call it El Castillo: they are the ruined walls of the tower of the lordship of Marentes, a preserve of the house of Ron until its incorporation into Ibias in 1827. It looks out over the Salime reservoir and has been inventoried as Asturian cultural heritage since 2013. Photo: Crdime (CC BY-SA 4.0) What to see and do in Ibias