Arroyomolinos droving trail Nature · Arroyomolinos, Comarca Sur, Madrid Image of Arroyomolinos, not of the place itself. A drovers' road that comes down from the River Guadarrama towards Móstoles following the course of the Combos stream; its nearly seven kilometres inside the district link the archaeological remains of medieval mills with recreation areas. Photo: Zarateman (CC0) What to see and do in Arroyomolinos