Eo, Oscos e Terras de Burón Biosphere Reserve Nature · A Fonsagrada, Fonsagrada, Lugo Image of A Fonsagrada, not of the place itself. A Fonsagrada is part of this cross-border biosphere reserve, declared by Unesco, which covers almost 160,000 hectares spread across fourteen municipalities, seven Galician —Ribadeo, Trabada, A Pontenova, A Ribeira de Piquín, Baleira, A Fonsagrada and Negueira de Muñiz— and seven Asturian —Castropol, Vegadeo, Taramundi, San Tirso de Abres, Vilanova de Oscos, Santa Eulalia de Oscos and San Martín de Oscos. It includes almost the entire basin of the río Eo, from its source at Fonteo to its mouth in the ría of Ribadeo, as well as stretches of the basins of the Miño, the Navia and the Porcía. When it was designated it had a population of 32,974, although almost all of its municipalities have been registering demographic decline. Photo: karmelegz (CC BY 3.0) What to see and do in A Fonsagrada