De Zegge, Nature reserve in Geel, Belgium.

De Zegge is a lowland peat marsh near the hamlet of Ten Aard in Geel, a remnant of the former 500-hectare Geels Gebroekt. Its 93 hectares, owned since 1952 by the Royal Zoological Society of Antwerp, hold turf pits, marsh and heath, with open grassland bordered by scattered bushes and a single rounded tree.

The Royal Zoological Society of Antwerp purchased this area in 1952, and it received official protection status as a nature reserve in 1985. This timeline shows how the site transitioned from private acquisition to formal conservation recognition.

The reserve lies near the hamlet of Ten Aard, in the Antwerp municipality of Geel. Its name refers to the low fen that once covered the area, of which De Zegge is a remnant. In 2019 the co-manager KMDA warned that groundwater pumping by nearby farms threatened the reserve's survival and asked the Flemish government to intervene.

De Zegge is only accessible under the guidance of a guide; there are no self-guided trails. The reserve lies near the church village of Ten Aard in the municipality of Geel, with the main entrance off the road to Ten Aard. Visitors should arrange a guided visit in advance through the managing organisations, the KMDA, Natuurpunt or the Agency for Nature and Forests.

De Zegge is one of the few places in Flanders where the grass snake (ringslang) occurs, together with the neighbouring reserves Mosselgoren and Neerhelst. The reserve is a remnant of the former 500-hectare lowland peat area of the Geels Gebroekt, of which only this part survives.