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Muroran Kō Breakwater Southwest Head Lighthouse

Iso G 6s🇯🇵Southern Hokkaidō, JPOperational

Location & Light Range

About Muroran Kō Breakwater Southwest Head Lighthouse

This white, round concrete tower stands 36 meters tall and houses a light with a focal plane of 13 meters. The structure, which has a lantern and gallery, is described as hourglass-shaped. Its light emits a green flash with a 3-second on and 3-second off cycle, visible for 5 nautical miles. The lighthouse is situated at the end of a breakwater, marking the southwestern entrance to Muroran. It is operational and located in southern Hokkaidō.

Light & Optic

Characteristic Signature
Iso G 6s
Flash Type
Isophase
Light Color
Green
Flash Count
1 flash
Interval
6s
Raw Code
Iso.G
Focal Height
13m
Geographic Range
5NM

Location

City
Southern Hokkaidō
Country
🇯🇵JP
Latitude
42.3445°
Longitude
140.9283°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
36m
Tower Shape
round
Tower Color
white
Material
concrete

Structure: White round concrete tower; 36

References & Identifiers

Admiralty No.
M6746.6
NGA No.
0696
ARLHS No.
JPN-917
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Frequently Asked Questions

How do mariners identify Muroran Kō Breakwater Southwest Head Lighthouse at night?+
Muroran Kō Breakwater Southwest Head displays the characteristic Iso G 6s — 1 green flash 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 green color may indicate a specific sector or warning zone.
Which ports and harbors does Muroran Kō Breakwater Southwest Head Lighthouse guide vessels into?+
Muroran Kō Breakwater Southwest Head Lighthouse assists vessels approaching 5 nearby ports. The closest is Muroran at 1.8 NM to the E. Other ports served include Noboribetsu (12.3 NM ENE), Youra (16.9 NM NW), Shiraoi (20.3 NM ENE), Moriage (20.5 NM SW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Muroran Kō Breakwater Southwest Head Lighthouse still active and maintained?+
Yes, Muroran Kō Breakwater Southwest Head 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.
How can I track vessels near Muroran Kō Breakwater Southwest Head Lighthouse?+
You can track vessels near Muroran Kō Breakwater Southwest Head 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.