The Poelaertplas is a large lake in the provincial domain De Gavers in Onkerzele, a sub-municipality of Geraardsbergen. The lake is approximately 20 hectares in size and has a maximum depth of 4.5 meters. You can swim, kayak, dive, fish or just enjoy the nature and the view. The lake is named after the Poelaert family, who used to own the domain. The lake was created by sand extraction for the construction of the E40 motorway in the 1970s.