In Casquita the Camino del Norte splits twice. Pay extra close attention to which route you chose as not all of them rejoin later.
At the first split, just past the chapel at the start of the village and indicated by two shells on a post, you are presented with the option to leave the Camino del Norte and head towards Oviedo and the start of the Camino Primitivo. If you wish to follow that trail (not described here) turn left. Otherwise keep on straight to follow the official camino.
Shortly ahead is the second split. Here the camino simply presents an option to stay on the road instead of turning left onto a lane. Here the road option is shorter and does not pass through Niévares.
For Oviedo and the Camino Primitivo: Turn left at the fork in the road in the direction of Camoca. The camino passes through several small hamlets on before arriving in San Pedro de Ambás: El Ronzon, La Fontana, El Campu, El Pelu Riva, and La Cruz. After La Cruz, at a small intersection with a picnic table in the middle, the camino splits. The camino is to the left, and the alternate route via Valdedíos is to the right. This alternate route adds 700m hundred meters and rejoins the camino at the Alto de la Campa. If you miss this turn, and still want to go through Valdedíos, stay on the road when you get to San Pedro de Ambás and there are more arrows directing you to Valdedíos.