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Ildjernsflu Lighthouse

Oc (3) White/Red/Green 10s🇳🇴Nesodden, NOOperational

Location & Light Range

About Ildjernsflu Lighthouse

Located on the east side of the Oslofjord, approximately 1 kilometer offshore from Nesodden, this concrete and fiberglass hexagonal tower stands 9 meters tall. The structure, first lit in 2016, exhibits a directional light with a focal height of 16 meters, visible for 12.2 nautical miles. Its color scheme features white with two narrow black horizontal bands and a red top. The light cycles through white, red, and green, showing three occluded flashes every 10 seconds. The original lightship at this location sank in 1929 after colliding with the steamship Storesand I, and its wreck is now a diving attraction.

Why it matters: This light guides maritime traffic in the busy Oslofjord, particularly for vessels navigating the eastern side near Nesodden.

Light & Optic

Characteristic Signature
Oc (3) White/Red/Green 10s
Flash Type
Occulting
Light Color
White/Red/Green
Flash Count
3 flashes
Interval
10s
Raw Code
Oc(3) WRG 10s
Focal Height
16m
Geographic Range
12.2NM

Construction & History

Year Built
2016

Significant events: original lightship sank after being rammed by the steamship Storesand I in February 1929

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
9m
Tower Shape
hexagonal
Tower Color
white with two narrow black horizontal bands and a red top
Material
concrete, fiberglass

Structure: hexagonal fiberglass tower mounted on a concrete pile

Location

City
Nesodden
Country
🇳🇴Norway
Region
Akershus
Sea Region
east side of the Oslofjord about 1 km offshore west of Nesodden
Latitude
59.8558°
Longitude
10.6310°

References & Identifiers

Nearest Port
Steilene(2.4 km)
ARLHS No.
NOR-129
Wikidata
Q12318136 →
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Frequently Asked Questions

How do mariners identify Ildjernsflu Lighthouse at night?+
Ildjernsflu displays the characteristic Oc (3) White/Red/Green 10s — 3 white/red/green flashes every 10 seconds. 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 white/red/green color may indicate a specific sector or warning zone.
Which ports and harbors does Ildjernsflu Lighthouse guide vessels into?+
Ildjernsflu Lighthouse assists vessels approaching 5 nearby ports. The closest is Snarøya at 1.7 NM to the NNW. Other ports served include Steilene (2.4 NM SSW), Lysaker (3.3 NM N), Oslo (3.8 NM NE), Sjursøja/Oslo (4.4 NM ENE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Ildjernsflu Lighthouse still active and maintained?+
Yes, Ildjernsflu 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 Ildjernsflu Lighthouse?+
Ildjernsflu 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 Ildjernsflu Lighthouse?+
You can track vessels near Ildjernsflu 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.