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Yamasedomari Kō South Breakwater Lighthouse

Oc Red 4s🇯🇵Hakodate, JPOperational

Location & Light Range

About Yamasedomari Kō South Breakwater Lighthouse

This red, cylindrical concrete lighthouse stands 11 meters tall on the south breakwater of Yamasedomari Kō, a small harbor south of Cape Esan in Hakodate. Its focal height is 12 meters, and it emits an occulting red light that flashes every 4 seconds, visible for 11 nautical miles. The structure, described as a round hourglass-shaped concrete tower with a lantern and gallery, was built of concrete. It is located approximately 3.5 kilometers from Toyoura, the nearest port. The light serves to mark the harbor entrance.

Why it matters: This lighthouse warns mariners of the south breakwater's extent, ensuring safe passage for local fishing boats and other small vessels entering the protected waters of the harbor. Its distinctive hourglass shape also makes it a recognizable landmark.

Light & Optic

Characteristic Signature
Oc Red 4s
Flash Type
Occulting
Light Color
Red
Interval
4s
Raw Code
Oc R 4s
Focal Height
12m
Geographic Range
11NM

Location

City
Hakodate
Country
🇯🇵Japan
Region
Hokkaido Prefecture
Sea Region
south breakwater of a small harbor on the south side of Cape Esan
Latitude
41.7858°
Longitude
141.1303°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
11m
Tower Shape
cylindrical
Tower Color
red
Material
concrete

Structure: round hourglass-shaped concrete tower with lantern and gallery

References & Identifiers

Nearest Port
Toyoura(3.5 km)
ARLHS No.
JPN-1015
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Frequently Asked Questions

How do mariners identify Yamasedomari Kō South Breakwater Lighthouse at night?+
Yamasedomari Kō South Breakwater displays the characteristic Oc Red 4s. 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 Yamasedomari Kō South Breakwater Lighthouse guide vessels into?+
Yamasedomari Kō South Breakwater Lighthouse assists vessels approaching 5 nearby ports. The closest is Odoh at 2.8 NM to the NE. Other ports served include Todohokke (2.8 NM NE), Toyoura (3.5 NM SW), Usujiri (12.2 NM NW), Oma (18.3 NM SSW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Yamasedomari Kō South Breakwater Lighthouse still active and maintained?+
Yes, Yamasedomari Kō South Breakwater 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 Yamasedomari Kō South Breakwater Lighthouse?+
Yamasedomari Kō South Breakwater Lighthouse is located within the Japan / Korea shipping lane — a busy shipping corridor linking the major ports of Japan and South Korea. This makes it an important navigation reference for commercial shipping traffic in the region.
How can I track vessels near Yamasedomari Kō South Breakwater Lighthouse?+
You can track vessels near Yamasedomari Kō South Breakwater 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.