For visiting boats
Christiansø Havn is the natural sound between Christiansø and Frederiksø in the Ertholmene, Denmark's easternmost point north-east of Bornholm, where Christian V built a naval fortress in 1684. The harbour is owned by the Ministry of Defence and can be entered from north or south in any weather; it is safe in all winds except a southerly gale, but the current in the harbour can run strongly either way. About 2,000 yachts call each year – yachts moor to buoys on the west side of the south and north harbours, and the bridge between the islands can be opened. When the harbour is closed because of sea or because it is full, three vertical red lights are shown at night, or a black ball by day, at the south end of Frederiksø. There is no holding-tank pump-out, you may not take on fresh water, and dogs may not go ashore without permission.
- Guest berths
- Vessels over 20 tonnes must book a berth with the harbour master before arrival. Pay dues, showers and laundry online on tallyweb (card valid for online payments). Harbour master available 16:00–17:00. Max 3 knots in harbour; max 12 knots within 1 nm.
- Limits
- length up to 50 m · beam up to 9 m
- Position
- 55°19.21′ N 15°11.15′ E (55.32016, 15.18590)
- Phone
- +45 40 45 20 14
- UN/LOCODE
- DK CSO
Prices
| Harbour dues 1–10 m 2024 rate (latest published); +50 % for multihulls | DKK 195 / night |
|---|---|
| Harbour dues 10–15 m 2024 rate (latest published); +50 % for multihulls | DKK 270 / night |
| Harbour dues 15–20 m 2024 rate (latest published); +50 % for multihulls | DKK 345 / night |
| Harbour dues 20–25 m 2024 rate (latest published); +50 % for multihulls | DKK 620 / night |
| Harbour dues over 25 m 2024 rate (latest published); +50 % for multihulls | DKK 880 / night |
| Short stay under 4 hours | DKK 10 / person |
Price list → · checked 19 Oct 2026 – prices may change
Services and facilities
© OpenStreetMap · OpenSeaMap — sea marks for the approach
Sailing here? Take VesselSOS with you.
- Family see you from shoreA live link in any browser – they don’t need the app.
- One tap to the right rescue centreHere JRCC Denmark – the app switches centre as you move, with your position and call script even without signal.
- Return-time checkIf you’re not back in time, your people know.
- Shared hazard mapRocks, nets and other hazards reported by other boaters.
Frequently asked
Who do I call in an emergency at sea here?
Sea rescue: JRCC Denmark +45 72 85 03 80. Or call 112. On the radio: MAYDAY on VHF channel 16.