Nekselø is a small Danish island in the Kattegat off the west coast of Zealand in the Bay of Sejrø.

[1] Nekselø consists of an impressive row of hills which culminates at a height of 41 meters at Elmebjerg and Gadebjerg.

The cliffs on the west coast are characterised by bushes shaped by the winds.

On the east coast, there are coastal meadows and grasslands with woodlands in between, presenting a variety of tree species.

Human traffic is prohibited outside the official nature paths from 1 April to 15 July, when birds are breeding.