We will leave the car in the village of San Crimenzo, in the municipality of Dumbría. We will approach a traditional washing place, where we will go down. A path will lead us to the first waterfall and the first of the watermills that we will find on the route. The San Crimenzo river flows into the Xallas river, in the Santa Uxía reservoir, at the level of Ponte do Peón. The path is not signposted.