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Takamastu Ko Lighthouse

Iso R 6s🇯🇵Seto Naikai Eastern, JPOperational

Location & Light Range

About Takamastu Ko Lighthouse

Also known as: せとしるべ

This red concrete tower stands 17 meters tall. Its focal height matches its structural height at 17 meters above sea level. The light emits a red hue with an isophase characteristic. This light pattern provides a steady on-off cycle for navigational purposes. The tower's construction uses concrete, and its distinctive red color aids in daytime identification.

Light & Optic

Characteristic Signature
Iso R 6s
Flash Type
Isophase
Light Color
Red
Flash Count
1 flash
Interval
6s
Raw Code
Iso
Focal Height
17m
Light Range
11NM (20.4 km)
Geographic Range
13NM

Location

City
Seto Naikai Eastern
Country
🇯🇵JP
Latitude
34.3615°
Longitude
134.0517°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
17m
Tower Color
red
Material
concrete

Structure: Red tower; 46

References & Identifiers

Admiralty No.
M5541.6
NGA No.
8176
Wikidata
Q11670448 →
OpenStreetMap
View on OSM →
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Frequently Asked Questions

How far offshore can Takamastu Ko Lighthouse be seen?+
With a focal height of 17 meters and a nominal range of 11 nautical miles (approximately 20.4 km), Takamastu Ko is visible from well offshore under standard atmospheric conditions. Actual visibility depends on observer height, weather, and sea state. This range makes it a significant coastal navigation aid for vessels transiting the area.
How do mariners identify Takamastu Ko Lighthouse at night?+
Takamastu Ko displays the characteristic Iso R 6s — 1 red flash every 6 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 red color may indicate a specific sector or warning zone.
Which ports and harbors does Takamastu Ko Lighthouse guide vessels into?+
Takamastu Ko Lighthouse assists vessels approaching 5 nearby ports. The closest is Takamatsu at 0.5 NM to the WNW. Other ports served include Naoshima (6.8 NM NNW), Ieura (7.9 NM N), Hibi (8.2 NM NW), Tamano (8.7 NM NW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Takamastu Ko Lighthouse still active and maintained?+
Yes, Takamastu Ko 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 Takamastu Ko Lighthouse?+
Takamastu Ko 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 Takamastu Ko Lighthouse?+
You can track vessels near Takamastu Ko 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.