Sjællands Odde is a 15 km long peninsula on the northwest coast of Zealand between the Kattegat and Sejerø Bay. From the outermost point of the peninsula, Gniben, a reef juts some 10 km out into the Kattegat.

In the Stone Age Sjaellands Odde was a series of islands, but deposits over thousands of years have made it part of Zealand.