Leave Barruera (1.090m) by its N, heading right along a short paved leg. Continue along the trail on the left and cross a small bridge. Walk on, skirting what used to be a river branch until you reach the entrance to the concrete factory. There, turn left and continue upriver along a leg surrounded by dry-stone walls until you hit a curve of the old road. Follow it to the right along some 350m, cross the L-500 road by the subterranean walkway and continue upwards along the trail, again surrounded by dry-stone walls. Just after crossing a ravine, you will reach Erill (1.250m) at the Plaça del Tarter square.