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Frihavn Sydmole Lighthouse

Fl Red 3s🇩🇰Copenhagen, DKOperational

Location & Light Range

About Frihavn Sydmole Lighthouse

Frihavn Sydmole lighthouse is a 12-meter-high cylindrical stone tower with a lantern and gallery. It is situated at the end of a long breakwater extending from the north side of Trekroner island, near Copenhagen. This structure is mounted on an early 19th-century stone fort. The lighthouse emits a red light, with one flash every 3 seconds, and has a geographic range of 13.2 nautical miles. Although its operational service has ended, the site is open to the public, offering views of the surrounding harbor entrance, but the tower itself remains closed.

Why it matters: This lighthouse is significant for its unique integration with an early 19th-century stone fort, showcasing a blend of defensive and navigational architecture at the entrance to a major harbor.

Light & Optic

Characteristic Signature
Fl Red 3s
Flash Type
Flashing
Light Color
Red
Interval
3s
Raw Code
Fl R 3s
Focal Height
20m
Light Range
7NM (13.0 km)
Geographic Range
13.2NM

Location

City
Copenhagen
Country
🇩🇰Denmark
Region
Capital Region of Denmark
Sea Region
Located at the end of the long breakwater extending from the north side of the island of Trekroner.
Latitude
55.7080°
Longitude
12.6118°

References & Identifiers

Nearest Port
Kobenhavn(1.0 km)
Admiralty No.
C1982
NGA No.
4808
ARLHS No.
DEN-044

Tower & Structure

Tower Height
12m
Tower Shape
cylindrical
Tower Color
white
Material
stone

Structure: round tower with lantern and gallery, mounted on an early 19th century stone fort

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How far offshore can Frihavn Sydmole Lighthouse be seen?+
With a focal height of 20 meters and a nominal range of 7 nautical miles (approximately 13.0 km), Frihavn Sydmole is visible from well offshore under standard atmospheric conditions. Actual visibility depends on observer height, weather, and sea state. As a shorter-range light, it primarily serves nearshore and coastal traffic.
How do mariners identify Frihavn Sydmole Lighthouse at night?+
Frihavn Sydmole displays the characteristic Fl Red 3s. Each lighthouse has a unique flash pattern published in the List of Lights, allowing mariners to positively identify it and distinguish it from other navigation aids in the area. The red color may indicate a specific sector or warning zone.
Which ports and harbors does Frihavn Sydmole Lighthouse guide vessels into?+
Frihavn Sydmole Lighthouse assists vessels approaching 5 nearby ports. The closest is København at 0.4 NM to the SSW. Other ports served include Nordhavn (0.6 NM SW), Tuborg (1.1 NM WNW), SUNDBY (2.7 NM SSE), Dyssegard (3.1 NM WNW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Frihavn Sydmole Lighthouse still active and maintained?+
Yes, Frihavn Sydmole Lighthouse is currently operational. It is actively maintained and continues to emit its characteristic light signal for marine navigation. Most modern lighthouses are automated and monitored remotely by the national maritime authority.
What shipping routes pass near Frihavn Sydmole Lighthouse?+
Frihavn Sydmole Lighthouse is located within the Baltic Sea trade route — a vital shipping corridor for trade between Scandinavian, German, Polish, and Baltic state ports. This makes it an important navigation reference for commercial shipping traffic in the region.
How can I track vessels near Frihavn Sydmole Lighthouse?+
You can track vessels near Frihavn Sydmole Lighthouse in real time using MarineRadar. The platform shows live AIS positions of ships in the area, including vessel name, type, flag, speed, and course. Use the "Track Vessels Nearby" button on this page to open the live map centered on this lighthouse.