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Ryioshi Wan Lighthouse

Fl (2) White 5s🇯🇵Kamaishi, JPOperational

Location & Light Range

About Ryioshi Wan Lighthouse

Also known as: Ryioshi Wan (Naka Ne)

Ryioshi Wan lighthouse is a 10-meter cylindrical concrete tower, painted black with a single red horizontal band. It stands on a shoal marking the center of Ryioshi Bay, an inlet located about 5 kilometers north of Kamaishi Bay. The lighthouse emits a white flash every 5 seconds from a focal height of 11 meters. Its geographic range extends to 10.7 nautical miles. The site is accessible by boat, though the tower itself is closed to the public.

Why it matters: This lighthouse marks a central shoal in Ryioshi Bay, warning vessels of a potential grounding hazard.

Light & Optic

Characteristic Signature
Fl (2) White 5s
Flash Type
Flashing
Light Color
White
Flash Count
2 flashes
Interval
5s
Raw Code
Fl W 5s
Focal Height
11m
Geographic Range
10.7NM

Location

City
Kamaishi
Country
🇯🇵Japan
Region
Iwate Prefecture
Sea Region
Ryioshi Bay, an inlet about 5 km north of Kamaishi Bay, marking a shoal in its center.
Latitude
39.3032°
Longitude
141.9021°

References & Identifiers

Nearest Port
Kamaishi(2.2 km)
Admiralty No.
M6593
NGA No.
4100

Tower & Structure

Tower Height
10m
Tower Shape
cylindrical
Tower Color
black with one red horizontal band
Material
concrete

Structure: round concrete tower with gallery, painted black with one red horizontal band

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Ryioshi Wan Lighthouse at night?+
Ryioshi Wan displays the characteristic Fl (2) White 5s — 2 white flashes every 5 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 white color may indicate a specific sector or warning zone.
Which ports and harbors does Ryioshi Wan Lighthouse guide vessels into?+
Ryioshi Wan Lighthouse assists vessels approaching 5 nearby ports. The closest is Kamaishi at 2.2 NM to the S. Other ports served include Otsuchi (2.2 NM S), Tagi (2.2 NM S), Yamada, Iwate (10.1 NM NNE), Sakihama (12.2 NM S). Mariners should consult the relevant chart for full approach and pilotage information.
Is Ryioshi Wan Lighthouse still active and maintained?+
Yes, Ryioshi Wan 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 Ryioshi Wan Lighthouse?+
Ryioshi Wan 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 Ryioshi Wan Lighthouse?+
You can track vessels near Ryioshi Wan 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.