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Ohamasaki Lighthouse

Iso WR 6s🇯🇵Seto Naikai Eastern, JPOperational

Ohamasaki Lighthouse was completed in 1894. Situated on Innoshima Island in Onomichi City, it overlooks the Bukagari Strait, a channel between Innoshima and Mukaijima. A tide station was established west of the lighthouse in the same year of its completion. A signal station was later built on a hill south of the lighthouse in 1910, and this structure is now preserved as the Lighthouse Memorial Hall within Innoshima Bridge Memorial Park.

Why it matters: The lighthouse is located in the central part of the Seto Inland Sea.

Background
大浜埼灯台(おおはまさきとうだい)は、瀬戸内海中央部、広島県尾道市の因島にある灯台。 1894年(明治27年)竣工。因島と向島に挟まれた海峡である「布刈瀬戸」を望む位置、因島大橋のたもとに位置する。その西側には同年に検潮所が置かれる。更に灯台の南側高台に1910年(明治43年)の信号所が造られ、現在では因島大橋記念公園内にある灯台記念館として保存されている。
Characteristic Signature
Iso WR 6s
Flash Type
Isophase
Light Color
WR
Flash Count
1 flash
Interval
6s
Raw Code
Iso.W.R. period 6s
Focal Height
18m
Light Range
12NM (22.2 km)
Geographic Range
12NM
Admiralty No.
M5724
NGA No.
8468
OpenStreetMap
View on OSM →
City
Seto Naikai Eastern
Country
🇯🇵JP
Latitude
34.3578°
Longitude
133.1734°
Flag
Type
Name
Dist.
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How far offshore can Ohamasaki Lighthouse be seen?+
With a focal height of 18 meters and a nominal range of 12 nautical miles (approximately 22.2 km), Ohamasaki 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 Ohamasaki Lighthouse at night?+
Ohamasaki displays the characteristic Iso WR 6s — 1 wr 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 wr color may indicate a specific sector or warning zone.
Which ports and harbors does Ohamasaki Lighthouse guide vessels into?+
Ohamasaki Lighthouse assists vessels approaching 5 nearby ports. The closest is Shigei at 1.5 NM to the WSW. Other ports served include Itozaki (1.6 NM NNW), Nomi (1.6 NM NNW), Omi (1.6 NM NNW), Onomichi (1.6 NM NNW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Ohamasaki Lighthouse still active and maintained?+
Yes, Ohamasaki 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 Ohamasaki Lighthouse?+
Ohamasaki 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 Ohamasaki Lighthouse?+
You can track vessels near Ohamasaki 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.