The Vesdre Dam holds back Lake Eupen a few kilometres southeast of town, where the forest closes in and the High Fens begin to feel near. It is one of the most satisfying easy excursions from Eupen: a big concrete wall, open water, and trails that lead into the surrounding woods.
The visitor area has wide views over the reservoir and the wooded valleys around it. Come by car or bike if you want to save time; on foot, treat it as a proper half-day outing rather than a quick stroll from Marktplatz.