Noorderhaaks also called Razende bol is an uninhabited Dutch island in the North Sea, a few kilometres west of the Marsdiep which separates the island of Texel from mainland Netherlands. The island covers an area of around five km², although the exact area varies due to tide and the dynamic nature of the area. Being relatively untouched by man, the island has become a valuable location due to its presence of several kinds of seabirds, and seals. The island is slowly moving eastward towards the Marsdiep and the Molengat, at a pace of around 100 metres a year. The island is visited by day trippers, and is also being used as a training ground for the Dutch navy and air force.