There are also two larger fen areas in the area: the Hazenputten and the Oude Putten. Anyone who now walks through the Vresselsbos will have difficulty imagining that there was hardly a tree in the last century. The originally much larger area consisted largely of sand drifts and heathland. Farmers lived on the edges of the area who were troubled by the shifting sands. To protect the fields, it was therefore decided to forest the drifting sands. At that time, almost exclusively softwood species were used and the name Vresselsche Heide from that time was split into the name Vresselsche Bosch and Vresselsche Heide. The remaining heathland has been further exploited to become an agricultural area, after which the name Vresselsche Heide disappeared.