Lucefécit Dam holds a small reservoir just north of Terena. It is not a major attraction, but it changes the rhythm of a day in Alandroal: after castles and whitewashed streets, the water and low hills give you a quiet landscape stop.
Come for a look, not for facilities. It works best as part of the Terena and Boa Nova loop, especially if the day is hot and the countryside feels dry.