Ría del Eo Nature · Castropol, Eo-Navia, Asturias An estuary shared with Galicia that has been on the Ramsar list of wetlands of international importance since 1994 and is also protected as a special protection area for birds and as a partial nature reserve. It forms at the mouth of the Eo river and is 10 kilometres long, with a fairly constant width of 800 metres and an area of 14 square kilometres; it narrows to 600 metres near the mouth, where a bridge stands, and widens to 1,200 metres in the Arnao cove. The Suarón river also flows into it on the Asturian side, and the Grande river on the Galician side. Photo: Lothar Wilhelm (CC BY-SA 2.0) What to see and do in Castropol