Get the MarineRadar appSatellite AISSatellite live trackingTrack any shipLive alerts112,000+ ships trackedDownload free

Kalvholm Lighthouse

Oc (2) White/Red/Green 6s🇫🇮Pargas, FIOperational

Location & Light Range

About Kalvholm Lighthouse

The Kalvholm lighthouse is a square concrete tower standing 7 meters tall, topped with a white lantern and gallery. Its structure is painted orange with a white lantern. Located on a small island west of the ship channel south of Lohm, it emits an occulting white, red, or green light, flashing twice every 6 seconds. This light has a geographic range of 9.3 nautical miles. The site is open to visitors, though the tower itself is closed to the public. Its nearest port is Nagu, 9.5 kilometers away.

Why it matters: This lighthouse is essential for safe navigation through the ship channel south of Lohm, where its directional light specifically guides vessels along the correct course. The unique occulting characteristic provides a distinct and reliable signal for mariners.

Light & Optic

Characteristic Signature
Oc (2) White/Red/Green 6s
Flash Type
Occulting
Light Color
White/Red/Green
Flash Count
2 flashes
Interval
6s
Raw Code
Oc(2) WRG 6s
Focal Height
7m
Light Range
3NM (5.6 km)
Geographic Range
9.3NM

Location

City
Pargas
Country
🇫🇮Finland
Region
Southwest Finland
Sea Region
An island on the west side of the ship channel south of Lohm.
Latitude
60.0864°
Longitude
21.6838°

References & Identifiers

Nearest Port
Nagu(9.5 km)
Admiralty No.
C4767.7.
Wikidata
Q62010405 →

Tower & Structure

Tower Height
7m
Tower Shape
square
Tower Color
orange with a white lantern
Material
concrete

Structure: square concrete tower with lantern and gallery

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.
Live tracking · 50,000+ mariners

Find Kalvholm Lighthouse on the live nautical map

Plan voyages near Finland, see nearby vessels in real time, and explore 14,900+ navigation aids in the app.

Nautical mapNearby vesselsVoyage planning
Get the App

Frequently Asked Questions

How far offshore can Kalvholm Lighthouse be seen?+
With a focal height of 7 meters and a nominal range of 3 nautical miles (approximately 5.6 km), Kalvholm 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 Kalvholm Lighthouse at night?+
Kalvholm displays the characteristic Oc (2) White/Red/Green 6s — 2 white/red/green flashes every 6 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 Kalvholm Lighthouse guide vessels into?+
Kalvholm Lighthouse assists vessels approaching 5 nearby ports. The closest is Korppoo (Korpo) at 6 NM to the NW. Other ports served include Nauvo (Nagu) (9.1 NM NE), Houtskari (Houtskär) (11.9 NM NW), Rymättylä (Rimito) (18.6 NM NNE), Iniö (20.6 NM NNW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Kalvholm Lighthouse still active and maintained?+
Yes, Kalvholm 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 Kalvholm Lighthouse?+
Kalvholm 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 Kalvholm Lighthouse?+
You can track vessels near Kalvholm 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.