Geography of Kalundborg Municipality

Sejerø is a Danish island in the Kattegat sea, north-west of Zealand. Sejerø with its 301 inhabitants is part of Kalundborg Municipality and covers an area of . The largest village on Sejerø is Sejerby, housing half of the island's population.

Nekselø is a small Danish island in the Kattegat off the west coast of Zealand in the Bay of Sejrø. Nekselø has an area of 2.2 km2 and is part of Kalundborg Municipality. As of 1 January 2025, it had a population of 15.

Reersø is a Danish town located on a small peninsula of the same name. It is located in the Great Belt between Korsør and Kalundborg on the western coast of the island of Zealand, and it is part of Kalundborg Municipality in Region Zealand. The town has a population of 504 (2025). left|thumb|Reersø Museum Reersø features cliffs on its outer western shore and salt marshes on the neck that cconnect it to the mainland. The area is home to several farms dating to the 16th century. Reersø is a popular tourist destination, and there are several summer houses in the area. Reersø is also home to sever