Montefurado is largely abandoned, apart from a few still occupied houses. One of them has a tap you can use for drinking water but ask first as a courtesy. There is also a small chapel dedicated to Santiago.
Pass through town and follow the trail to your left. You will have to step over a small wall. When the trail rejoins the road (AS-14) a few km onward, you can either stay on the track or follow along the road to Lago.