Getting there
Getting there, parking, sleeping and eating: the four bits of homework solved with real data, so your day on the greenway starts well before you set foot on it. The greenway lies in the Trubia valleys, south-west of Oviedo, with three main access points: Entrago (south), Tuñón (north) and Proaza (middle).
By car from Oviedo: 40 km, 45 minutes. A-63 towards Grado, exit 9 for Trubia, and the AS-228 up the valley: first Tuñón, then Proaza and Caranga, and 7 km further on, Entrago.
From Gijón: 70 km, 1 hour (A-8 + A-66 + A-63, almost all motorway). From León: 85 km, 1 h 15 via the Huerna AP-66 and the Ventana pass — a beautiful mountain approach. And from Somiedo, 45 km (50 min) via the AS-265 and the San Lorenzo pass, in case you combine the greenway with bear watching.
By public transport
The Oviedo–San Martín de Teverga bus line runs the length of the valley with stops in Tuñón, Proaza, Caranga and Entrago (~55 minutes from Oviedo); timetables change by season, so confirm them in the Asturias Transport Consortium journey planner before you go. The full city-by-city guide is in getting there.
By bike from Oviedo
The locals' secret: you can pedal from Oviedo to the greenway almost without touching a road — 34 km (2.5-3 h) linking the Parque de Invierno, the Fuso greenway and the Nora corridor to Trubia, then the AS-228 to Tuñón.