In the summer of 1991 the dune region between Hock van Holland and The Hague was surveyed intensively by naturalists. This narrow strip of dunes and shrubs had previously not been regarded as being interesting for butterfly surveys. However, in the recent survey 25 different butterfly species were observed. The most numerous species found was Maniola jurtina. A detailed report is given of the observed butterfly species and the food plants in the region.