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Ryotsu Ko North Breakwater Lighthouse

Fl R 4s🇯🇵Honshu-Northwest Coast, JPOperational

Location & Light Range

About Ryotsu Ko North Breakwater Lighthouse

This concrete tower stands 40 meters high and exhibits white and red banding. Its light is positioned at a focal height of 19 meters above the water. The lighthouse emits a single red flash every 4 seconds, with a geographic range of 7 nautical miles. However, the light's visibility is obstructed between 000 and 250 degrees due to the surrounding landmass.

Light & Optic

Characteristic Signature
Fl R 4s
Flash Type
Flashing
Light Color
Red
Flash Count
1 flash
Interval
4s
Raw Code
Fl.R. period 4s
Focal Height
19m
Light Range
7NM (13.0 km)
Geographic Range
7NM

Location

City
Honshu-Northwest Coast
Country
🇯🇵JP
Latitude
38.0809°
Longitude
138.4499°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
40m
Tower Color
white and red
Material
concrete

Structure: White concrete tower, red banded; 40. Obscured 000°-250° by land

References & Identifiers

Admiralty No.
M7094
NGA No.
3292
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Frequently Asked Questions

How far offshore can Ryotsu Ko North Breakwater Lighthouse be seen?+
With a focal height of 19 meters and a nominal range of 7 nautical miles (approximately 13.0 km), Ryotsu Ko North Breakwater 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 Ryotsu Ko North Breakwater Lighthouse at night?+
Ryotsu Ko North Breakwater displays the characteristic Fl R 4s — 1 red flash every 4 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 red color may indicate a specific sector or warning zone.
Which ports and harbors does Ryotsu Ko North Breakwater Lighthouse guide vessels into?+
Ryotsu Ko North Breakwater Lighthouse assists vessels approaching 5 nearby ports. The closest is Ryotsu at 0.6 NM to the SW. Other ports served include Shirose (3.6 NM N), OTA (10.2 NM S), Futami, Niigata (10.8 NM SW), Akadomari (12.6 NM S). Mariners should consult the relevant chart for full approach and pilotage information.
Is Ryotsu Ko North Breakwater Lighthouse still active and maintained?+
Yes, Ryotsu Ko North 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 Ryotsu Ko North Breakwater Lighthouse?+
Ryotsu Ko North 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 Ryotsu Ko North Breakwater Lighthouse?+
You can track vessels near Ryotsu Ko North 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.