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Tonaki Shima Lighthouse

Iso White 8s🇯🇵Tonaki, JPOperational

Location & Light Range

About Tonaki Shima Lighthouse

A square cylindrical concrete tower painted white, Tonaki Shima Lighthouse stands 10.5 meters tall with its light positioned 15 meters above the water. It was first lit in 1978, emitting an isophase white light that cycles every 8 seconds. The lighthouse is situated on the waterfront on the northwestern side of Tonaki Island. This island lies about 50 km west-northwest of Naha and 25 km south of Aguni Shima. The site is open to the public, though the tower itself is closed.

Why it matters: This lighthouse aids navigation around the remote island, particularly for the ferry service connecting Tonaki to Naha and for local fishing fleets. It marks the northwestern approach to the island, helping mariners avoid hazards.

Light & Optic

Characteristic Signature
Iso White 8s
Flash Type
Isophase
Light Color
White
Interval
8s
Raw Code
Iso W 8s
Focal Height
15m
Geographic Range
11.9NM

Construction & History

Year Built
1978

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
10.5m
Tower Shape
cylindrical
Tower Color
white
Material
concrete

Structure: square cylindrical concrete tower

Location

City
Tonaki
Country
🇯🇵Japan
Region
Okinawa Prefecture
Sea Region
Located on the waterfront of Tonaki, on the northwestern side of the island. Tonaki Shima is about 50 km west northwest of Naha and 25 km south of Aguni Shima.
Latitude
26.3725°
Longitude
127.1410°

References & Identifiers

Nearest Port
Zamami(12.4 km)
ARLHS No.
JPN-670
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Frequently Asked Questions

How do mariners identify Tonaki Shima Lighthouse at night?+
Tonaki Shima displays the characteristic Iso White 8s. 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 Tonaki Shima Lighthouse guide vessels into?+
Tonaki Shima Lighthouse assists vessels approaching 5 nearby ports. The closest is Zamami at 12.4 NM to the SE. Other ports served include Tokashiki (16.2 NM SE), Kanegusuku (20.7 NM W), Naha, Okinawa (29.7 NM ESE), Ginowan (30.7 NM ESE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Tonaki Shima Lighthouse still active and maintained?+
Yes, Tonaki 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.
How can I track vessels near Tonaki Shima Lighthouse?+
You can track vessels near Tonaki 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.