Flakfortet Havn

Flakfortet Havn sits on a remarkable artificial island in the Øresund strait, giving you direct access to the historic sea fort built in the late 1800s as part of Copenhagen's coastal defenses. You can moor here with your own boat and explore the fort's tunnels, gun emplacements, and open-air museum — it's one of those rare marinas where the destination is genuinely the point. The surrounding water views back toward Copenhagen and across to Sweden make it stand out from anything you'd find on the mainland.