Noorderhaaks (Dutch pronunciation: [ˌnoːrdərˈɦaːks]), also called Razende Bol (Raging sandbank in Dutch; in modern Dutch Bol means sphere, but in this context the old Dutch meaning of sandbank is meant^[1]), is an uninhabited Dutch island^[2] in the North Sea, a few kilometres west of the Marsdiep which separates the island of Texel from the mainland of the Netherlands. The island covers an area of around 5 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.^[2] Noorderhaaks is probably the sixth sand bar to develop in the mouth of the Marsdiep, since it formed in the late twelfth century via a flood that occurred in 1170. The previous five have also moved towards Texel and got accreted to the island, with intervals of approximately 150 years each.^[3]

The island is visited by day trippers, and is also being used as a training ground for the Royal Dutch Navy and Air Force.

• Satellite photo, taken circa 1992
• Stranded humpback whale (2012)
• Time-lapse (1984-2017)