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Ōtsuchi Shirahama Breakwater Lighthouse

Fl Green 3s🇯🇵Kamaishi, JPOperational

Location & Light Range

About Ōtsuchi Shirahama Breakwater Lighthouse

The Ōtsuchi Shirahama Breakwater light is a 9-meter white concrete post attached to a 1-story concrete equipment shelter. This structure stands 12 meters above sea level and emits a green flash every 3 seconds, visible for 11 nautical miles. It is situated on the main breakwater protecting Shirahama harbor, located on the south side of Ōtsuchi Bay in Japan's Iwate Prefecture. The nearest port, Otsuchi, is 1.7 kilometers away.

Why it matters: This light is essential for the safe navigation of fishing vessels and small craft entering Shirahama harbor, clearly marking the breakwater to prevent collisions within Ōtsuchi Bay.

Light & Optic

Characteristic Signature
Fl Green 3s
Flash Type
Flashing
Light Color
Green
Interval
3s
Raw Code
Fl G 3s
Focal Height
12m
Geographic Range
11NM

Location

City
Kamaishi
Country
🇯🇵Japan
Region
Iwate Prefecture
Sea Region
Shirahama harbor, on the south side of Ōtsuchi Bay
Latitude
39.3305°
Longitude
141.9428°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
9m
Tower Shape
post
Tower Color
white
Material
concrete

Structure: A 9m white concrete post is attached to a square 1-story concrete equipment shelter.

References & Identifiers

Nearest Port
Otsuchi(1.7 km)
Admiralty No.
M6594.5
NGA No.
4092
USCG No.
JCG-1664.5
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Frequently Asked Questions

How do mariners identify Ōtsuchi Shirahama Breakwater Lighthouse at night?+
Ōtsuchi Shirahama Breakwater displays the characteristic Fl Green 3s. 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 Ōtsuchi Shirahama Breakwater Lighthouse guide vessels into?+
Ōtsuchi Shirahama Breakwater Lighthouse assists vessels approaching 5 nearby ports. The closest is Kamaishi at 4.3 NM to the SSW. Other ports served include Otsuchi (4.3 NM SSW), Tagi (4.3 NM SSW), Yamada, Iwate (8 NM NNE), Sakihama (14.2 NM SSW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Ōtsuchi Shirahama Breakwater Lighthouse still active and maintained?+
Yes, Ōtsuchi Shirahama 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 Ōtsuchi Shirahama Breakwater Lighthouse?+
Ōtsuchi Shirahama 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 Ōtsuchi Shirahama Breakwater Lighthouse?+
You can track vessels near Ōtsuchi Shirahama 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.