The Terheijdense Binnenpolder is a nature reserve east of Terheijden in North Brabant. It measures 120 ha and is owned by Staatsbosbeheer.
It is a bowl-shaped peat meadow area with a ground level of up to 1.3 meters below NAP. For centuries it was a swamp area, created between the 13th and 15th centuries by cutting peat.
Before it was drained in the mid-1950s, this inland polder was a rare marsh and nature reserve. Seepage occurred from the Kempens Blok, and orchids and rare sedge species, as well as Spanish horse, grew in the blue grasslands. The bittern, black tern, Montagu's harrier and marsh harrier, bluethroat and reed warbler bred there. See in this context also: Seam of Brabant.
Nowadays, the most important biotopes can be found mainly along the ditch sides and in the ditches: crab shear, marsh salt grass, water violet, large buttercup, hollow pipe, water eppe and large bladderwort are found there.
In the center of the area is a duck decoy, called the Rear Cage. It was built in 1693 and was in use until 1934. Then it fell into disrepair, only to be restored from 1969. A second cage in the area, called the Front Cage, has disappeared. The cage also included a fin track.
In 2006 and 2007 the nutrient-rich upper layer was removed. Pet holes were also repaired. In 2009, a walking route was created in the area: Het Zeggepad.
In the northeast, this area connects to the Line of Den Hout, also a nature reserve with great cultural-historical values.
Source: Wikipedia