These four areas are part of the De Maasduinen National Park. The Bleijenbeek estate consists of coniferous forest, heather remnants and fens. De Duivelskuil is the most striking of these, it is a heath and fen area in an extinct basin surrounded by river dunes. The walking tour also takes you over the golf course and along the castle ruins on the estate. The ruins are of Bleijenbeek Castle, which was built just before the 14th century and was destroyed by British bombers at the end of the Second World War. After removing bombs and grenades from the grounds within the moat and shoring up the tower, the ruins have been neglected for over 60 years. A few years ago, a start was made on refurbishing the ruins, the grounds within the moat and the outer moat. After leaving the estate, the walking tour continues through the Eckeltse Bergen, along the Eendenmeer and through the Bergerheide. The Eendenmeer is a beautiful wetland area surrounded by heathland, with beautiful views in a number of places. The Bergerheide is a very varied area, including the large Driessenven and a drifting sand area. The starting point of Nieuw Bergen is a relatively young residential area east of Bergen. Since Bergen lies in the floodplains of the Meuse and is bordered by dikes, the village had virtually no expansion options. That is why the city council decided in 1955 to establish a new residential area to the east. This residential core was given the official name Nieuw-Bergen on 9 July 1963.