Bay of Aarhus

The bay stretches over an area of 610 square kilometres (240 sq mi) and consists of a flat bassin, increasing in depth from 14 m in the west to 18 m in the east.

The bay mainly exchanges water with the Kattegat through a deep trench along Helgenæs with depths to 50 m. In the bay's southern section there are a number of stony reefs including Norsminde Flak, Wulffs Flak, Mejlflak and Tunø Knob.

[1] In 2002, the inner Danish waters suffered serious and prolonged hypoxia with the Bay of Aarhus being hit especially hard.

[2] In 2013, planning for an offshore windmill park in the bay on the shallow reef of Mejlflak between Tunø, Samsø and Helgenæs was initiated, scheduled to be completed in 2017.

[3] In September 2015, the project was put on hold indefinitely as it was not found profitable for energy company NRGi.