The geosite Coastal dunes of southwest Walcheren consists of the dune area at the mouth of the Westerschelde. The dune tops reach about 50 meters + NAP, making them among the highest in the Netherlands. They were deposited on the older tidal landscape that was partially eroded by intrusions from the Westerschelde. The dune area is remarkably narrow, steep and high. This is due in part to a more than ten-meter-deep tidal channel eroding the over, the Oostgat. Because of the dangerous situation with the deep Oostgat near the coast, this dune area is very meticulously maintained by man.
