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Ryūtōan Shima Lighthouse

Fl (2) W 5s🇯🇵Northern Honshū, JPOperational

Location & Light Range

About Ryūtōan Shima Lighthouse

This concrete beacon stands on Northern Honshū. The structure is a white tripod tower, measuring 16 meters at focal height. It emits two white flashes every 5 seconds. The light has a geographic range of 5 nautical miles.

Light & Optic

Characteristic Signature
Fl (2) W 5s
Flash Type
Flashing
Light Color
White
Flash Count
2 flashes
Interval
5s
Raw Code
Fl.(2)W. period 5s
Focal Height
16m
Geographic Range
5NM

Location

City
Northern Honshū
Country
🇯🇵JP
Latitude
38.6871°
Longitude
139.6176°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Shape
tripod
Tower Color
white
Material
concrete

Structure: White concrete beacon, tripod

References & Identifiers

Admiralty No.
M7087.9
NGA No.
3444
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Frequently Asked Questions

How do mariners identify Ryūtōan Shima Lighthouse at night?+
Ryūtōan Shima displays the characteristic Fl (2) W 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.
Which ports and harbors does Ryūtōan Shima Lighthouse guide vessels into?+
Ryūtōan Shima Lighthouse assists vessels approaching 5 nearby ports. The closest is Kobato at 1.2 NM to the E. Other ports served include Atsumi (3.8 NM SSW), Yura, Yamagata (3.9 NM ENE), Kamo (7.1 NM NE), Nezugaseki (8.2 NM SSW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Ryūtōan Shima Lighthouse still active and maintained?+
Yes, Ryūtōan Shima 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 Ryūtōan Shima Lighthouse?+
Ryūtōan Shima 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 Ryūtōan Shima Lighthouse?+
You can track vessels near Ryūtōan Shima 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.