Noordwijk is a town and municipality in the west of the Netherlands, in the province of South Holland. The municipality covers an area of 51.53 km² (of which 16.12 km² is water) and had a population of 24,707 in May 2006. The municipality of Noordwijk consists of the communities Noordwijk aan Zee and Noordwijk-Binnen, separated by a narrow green belt. Besides its beaches, Noordwijk is also known for its bulb flower fields. It is located in an area called the "Dune and Bulb Region". Noordwijk is also the location of the headquarters for the European Space Research and Technology Centre (ESTEC), part of the European Space Agency (ESA). ESA's visitors' centre Space Expo is a permanent space exhibition. Noordwijk aan Zee is rated as one of the richest locations in the Netherlands. Beer magnate Freddy Heineken has built a villa there with the characteristic green roof.