The Karthuizerduinen, named after a former Carthusian monastry, cover about 24 hectares. They can be seen as the eastern embranchmet of Ter Yde. There is a bare undulating sand mass that can hardly be controlled. Between the dusty parabolic dunes, there are vegetated pans, but within the dynamics of the shifting dunes they will have to disappear under the drifting sand, while they grow back in other places. So far the theoretical model. In practice, it is a landscape that moves between five and ten meters a year to the northeast. It is seen as a constant threat for a number of homes and for residential areas. That is why, since 1979, a lot of work has been done to slow down and anchor the dunes.