This powerful waterfall gushing down the rock face is 46km west of San Martín de los Andes, accessible via the unpaved, winding RP 48 and then by a 5km dirt road near the Hua Hum border post. It's worth a stop if you're driving to Chile or if you want to spend the day picnicking.
Cascada Chachín
Bariloche & the Lake District