Christiansø · Denmark

Ertholmene / Christiansø

A tiny fortified island group east of Bornholm, reached by boat and explored on foot.

Ertholmene / Christiansø Arek / Arek1979 · CC BY-SA 3.0
Typical visit
3 hours
Setting
Outdoor
Region
Bornholm
Last checked
10 Aug 2026

Why visit

Ertholmene / Christiansø is a useful Bornholm stop for travellers interested in islands. A tiny fortified island group east of Bornholm, reached by boat and explored on foot. The experience centres on Historic fortifications, Harbour settlement, Rocky island coastline. Its location around Christiansø gives it a clear role in a regional itinerary, adding a specific historical, cultural or natural experience without requiring a detour simply to increase the number of stops.

What you will see

  • Historic fortifications.
  • Harbour settlement.
  • Rocky island coastline.

History

Christiansø and Frederiksø were fortified from the late seventeenth century as a naval outpost, leaving a compact military settlement.

Photographs

Arek / Arek1979 · CC BY-SA 3.0 · full attribution on the image credits page.

Visitor tips

  1. 1

    Boat access is essential, and the islands have cobbles, steps and uneven rock; weather can disrupt sailings.

  2. 2

    Check the official source shortly before travel for current access, opening, transport and booking information.

About Bornholm

Granite coast, medieval ruins, round churches, beaches, forest and the offshore Ertholmene islands.

Open the Denmark guide

Combine it with

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