Pozo de los Humos, Waterfall in Arribes del Duero Natural Park, Salamanca, Spain

Pozo de los Humos is a waterfall in the Arribes del Duero Natural Park that drops about 50 meters into the Uces River. The water plunges between Masueco and Pereña de la Ribera, creating a powerful cascade through a rocky canyon.

The falls form where the Uces river crosses a geological fault that brings granite into contact with softer metamorphic rock, which erosion has worn away. The river widens above the obstacle and overflows it, dropping 50 metres down a granite wall. The Basque writer Miguel de Unamuno recorded his fascination on seeing the cascade from Masueco.

The name comes from the mist that rises when water crashes down, looking like smoke drifting from the rocks below. You can see this effect clearly from either viewing point, especially on humid mornings.

Two hiking trails lead to viewing spots: one from Masueco for close views and another from Pereña for wider perspectives. Wear sturdy shoes as the paths can be muddy and uneven after rain.

A few metres before the main drop, the Uces splits and forms a second waterfall on the right bank, the Pozo de las Vacas. Local legend says a cart loaded with wheat, pulled by two cows and heading for a nearby mill, went over the edge there.