Starting from San Vicente take the N634 before turning off onto the N621 to Unquera. Starts off a nice low level road with sweping bends & scenery before it starts to climb into the Picos de europa Mountains. A fantastci run along a mountain gorge with tight bend after tight bend before the road calms down a bit as you approach Potes. As you leve Potes the road gets a little narrower and realy starts to get intersting as you start to climb up to the summit at Puerto de San Glorio at 1609m - there is view after view of fantastic mountain scenery and more bends than you can shake a stick at. As you begin to drop down towards Riano the road surface changes for the better and the road is slightly wider, rewarding you with faster sweeping bends and a few good straights until you arrive at Riano which is surrounded by lakes... there is a service station at the entrance to the village with the best view I've ever had whilst fulelling and a great little Cantina just behind the service station to refuel the rider.