Reservoir of San Martiño Nature · A Rúa, Valdeorras, Ourense Image of A Rúa, not of the place itself. The Encoro de San Martiño is a dam built in 1956 by Dragados y Construcciones on the river Sil, between the Valdeorras concellos of A Rúa and Petín, with a small part in the district of Quiroga; it now belongs to Iberdrola. It is 25 metres high and 125 metres long, holds back about 10 cubic hectometres of water and its tail reaches 1.7 kilometres. On the A Rúa shore, the power company planted a poplar wood to protect the bank from flooding, today turned into a recreational area. The reservoir created a wetland of great ecological interest which in the 1980s came to record more than 1,800 wildfowl, as well as storks and kingfishers. Photo: Estevoaei (CC BY-SA 4.0) What to see and do in A Rúa