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Ryuosaki Lighthouse

Fl W 12s🇯🇵Nanpo-Shoto, JPOperational

Location & Light Range

About Ryuosaki Lighthouse

The Ryuosaki lighthouse is a green, round concrete structure. It serves as a pile beacon, standing 67 meters above sea level. The lighthouse emits a white light, flashing once every 12 seconds. This navigational aid is situated in Nanpo-Shoto.

Why it matters: The light has a geographic range of 20 nautical miles.

Light & Optic

Characteristic Signature
Fl W 12s
Flash Type
Flashing
Light Color
White
Flash Count
1 flash
Interval
12s
Raw Code
Fl.W. period 12s
Focal Height
67m
Light Range
20NM (37.0 km)
Geographic Range
20NM

Location

City
Nanpo-Shoto
Country
🇯🇵JP
Latitude
34.6857°
Longitude
139.4433°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Shape
round
Tower Color
green
Material
concrete

Structure: Green pile beacon

References & Identifiers

Admiralty No.
M6280
NGA No.
5488
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Frequently Asked Questions

How far offshore can Ryuosaki Lighthouse be seen?+
With a focal height of 67 meters and a nominal range of 20 nautical miles (approximately 37.0 km), Ryuosaki is visible from well offshore under standard atmospheric conditions. Actual visibility depends on observer height, weather, and sea state. Lights of this range are typically used as landfall lights by vessels approaching from the open sea.
How do mariners identify Ryuosaki Lighthouse at night?+
Ryuosaki displays the characteristic Fl W 12s — 1 white flash every 12 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 Ryuosaki Lighthouse guide vessels into?+
Ryuosaki Lighthouse assists vessels approaching 5 nearby ports. The closest is Nishitokyo at 5.3 NM to the ENE. Other ports served include Okada (6.9 NM NNW), Toshima/Tokyo (13.4 NM SW), Inatori (20.3 NM WNW), Shimoda, Shizuoka (24.1 NM W). Mariners should consult the relevant chart for full approach and pilotage information.
Is Ryuosaki Lighthouse still active and maintained?+
Yes, Ryuosaki 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 Ryuosaki Lighthouse?+
Ryuosaki 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 Ryuosaki Lighthouse?+
You can track vessels near Ryuosaki 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.