This centuries-old long dyke marks the border between the Betuwe to the east and the lowlands to the west. The purpose of the Diefdijk was to protect the lower-lying meadows whenever the higher Betuwe flooded. The dyke was reinforced in 2015 and still serves its purpose today. It was also part of the New Dutch Waterline: the area to the east of the dyke served as an inundation area. To this day, this area remains scarcely built up. Nature reserves of various sizes border the dyke on either side.