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Mizunokojima Lighthouse

Fl W 10s🇯🇵Bungo Suido, JPOperational

Location & Light Range

About Mizunokojima Lighthouse

Constructed in 1904, this lighthouse became operational that same year. Its light, situated 56 meters above sea level, emits a single white flash every 10 seconds. The lighthouse's structure reaches a focal height of 56 meters, providing a geographic range of 20 nautical miles. This facility is part of Japan's navigational infrastructure. It is an active aid to navigation.

Why it matters: This lighthouse is listed on the Japanese National Register of Historic Monuments.

Background
Mizunokojima Lighthouse (水ノ子島灯台, Mizunokojima Tōdai) is an active lighthouse located in Japan's Bungo Channel.

Light & Optic

Characteristic Signature
Fl W 10s
Flash Type
Flashing
Light Color
White
Flash Count
1 flash
Interval
10s
Raw Code
Fl.W. period 10s
Focal Height
56m
Light Range
20NM (37.0 km)
Geographic Range
20NM

Location

City
Bungo Suido
Country
🇯🇵JP
Latitude
33.0438°
Longitude
132.1767°

Nearby Vessels

Flag
Type
Name
Dist.

Construction & History

Year Built
1904
Heritage Status
Q11385748

References & Identifiers

Admiralty No.
M4912
NGA No.
10464
Wikipedia
Read on Wikipedia →
Wikidata
Q6884889 →
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Frequently Asked Questions

How far offshore can Mizunokojima Lighthouse be seen?+
With a focal height of 56 meters and a nominal range of 20 nautical miles (approximately 37.0 km), Mizunokojima 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 Mizunokojima Lighthouse at night?+
Mizunokojima displays the characteristic Fl W 10s — 1 white flash every 10 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 Mizunokojima Lighthouse guide vessels into?+
Mizunokojima Lighthouse assists vessels approaching 5 nearby ports. The closest is Urashiro at 13.1 NM to the WSW. Other ports served include Saiki (13.7 NM WSW), Tsukumi (15.6 NM W), Iwamatsu (17.2 NM ENE), Misho (18.9 NM ESE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Mizunokojima Lighthouse still active and maintained?+
Yes, Mizunokojima 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 Mizunokojima Lighthouse?+
Mizunokojima 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 Mizunokojima Lighthouse?+
You can track vessels near Mizunokojima 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.