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Yokohama Honmoku Breakwater Lighthouse

Fl Green 4s🇯🇵Yokohama, JPOperational

Location & Light Range

About Yokohama Honmoku Breakwater Lighthouse

The Yokohama Honmoku Breakwater lighthouse is a cylindrical white tower standing 22 meters tall, with its light at a focal height of 23 meters. It is situated at the north end of the detached Honmoku Breakwater, marking the southeast corner of Yokohama harbor. This active aid emits a green light with a 4-second cycle. Its geographic range extends to 13.8 nautical miles. The lighthouse is accessible by boat, and while the tower itself is closed to the public, the surrounding site is open.

Why it matters: This lighthouse guides vessels around the detached Honmoku Breakwater, contributing to maritime safety within Yokohama harbor and supporting international trade.

Light & Optic

Characteristic Signature
Fl Green 4s
Flash Type
Flashing
Light Color
Green
Interval
4s
Raw Code
Fl G 4s
Focal Height
23m
Light Range
12NM (22.2 km)
Geographic Range
13.8NM

Location

City
Yokohama
Country
🇯🇵Japan
Region
Kanagawa Prefecture
Sea Region
Southeast corner of Yokohama harbor, at the north end of the detached Honmoku Breakwater, opposite the Daikoku Breakwater West Head Light.
Latitude
35.4390°
Longitude
139.6896°

References & Identifiers

Nearest Port
Yokohama(3.2 km)

Tower & Structure

Tower Height
22m
Tower Shape
cylindrical
Tower Color
white

Structure: round cylindrical tower with lantern and gallery, painted white

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 Yokohama Honmoku Breakwater Lighthouse be seen?+
With a focal height of 23 meters and a nominal range of 12 nautical miles (approximately 22.2 km), Yokohama Honmoku Breakwater is visible from well offshore under standard atmospheric conditions. Actual visibility depends on observer height, weather, and sea state. This range makes it a significant coastal navigation aid for vessels transiting the area.
How do mariners identify Yokohama Honmoku Breakwater Lighthouse at night?+
Yokohama Honmoku Breakwater displays the characteristic Fl Green 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 green color may indicate a specific sector or warning zone.
Which ports and harbors does Yokohama Honmoku Breakwater Lighthouse guide vessels into?+
Yokohama Honmoku Breakwater Lighthouse assists vessels approaching 5 nearby ports. The closest is Yokohama at 2 NM to the SW. Other ports served include Higashi-Ogishima (5.3 NM NE), Asahimachi (5.7 NM N), Kawasaki (5.7 NM NE), Tsuzuki Ku (8.3 NM NW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Yokohama Honmoku Breakwater Lighthouse still active and maintained?+
Yes, Yokohama Honmoku 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 Yokohama Honmoku Breakwater Lighthouse?+
Yokohama Honmoku 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 Yokohama Honmoku Breakwater Lighthouse?+
You can track vessels near Yokohama Honmoku 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.