Kanmon Tunnel
E350194
The Kanmon Tunnel is an undersea railway and road tunnel in Japan that links the islands of Honshu and Kyushu beneath the Kanmon Straits.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Kanmon Railway Tunnel | 3 |
| Kanmon Road Tunnel | 3 |
| Kanmon Tunnel canonical | 2 |
| Kanmon Pedestrian Tunnel | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3310521 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Kanmon Tunnel Context triple: [Western Japan, connectedBy, Kanmon Tunnel]
-
A.
Ohashi
Ohashi is a neighborhood within Tokyo’s Meguro ward, known as a residential area with convenient urban access.
-
B.
Roki Tunnel
Roki Tunnel is a strategic road tunnel through the Caucasus Mountains that serves as a key transport link between Russia and the breakaway region of South Ossetia in Georgia.
-
C.
Shimanami Kaido
Shimanami Kaido is a scenic expressway and cycling route in Japan that spans a series of bridges and islands across the Seto Inland Sea, linking the islands of Honshu and Shikoku.
-
D.
Seto Ohashi Bridge
The Seto Ohashi Bridge is a massive series of double-deck bridges in Japan that carries both road and rail traffic across the Seto Inland Sea between Honshu and Shikoku.
-
E.
Irabu Ohashi Bridge
Irabu Ohashi Bridge is a long sea-crossing bridge in Okinawa Prefecture, Japan, known for connecting Miyako-jima and Irabu-jima and offering scenic views over clear blue waters.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Kanmon Tunnel Target entity description: The Kanmon Tunnel is an undersea railway and road tunnel in Japan that links the islands of Honshu and Kyushu beneath the Kanmon Straits.
-
A.
Ohashi
Ohashi is a neighborhood within Tokyo’s Meguro ward, known as a residential area with convenient urban access.
-
B.
Roki Tunnel
Roki Tunnel is a strategic road tunnel through the Caucasus Mountains that serves as a key transport link between Russia and the breakaway region of South Ossetia in Georgia.
-
C.
Shimanami Kaido
Shimanami Kaido is a scenic expressway and cycling route in Japan that spans a series of bridges and islands across the Seto Inland Sea, linking the islands of Honshu and Shikoku.
-
D.
Seto Ohashi Bridge
The Seto Ohashi Bridge is a massive series of double-deck bridges in Japan that carries both road and rail traffic across the Seto Inland Sea between Honshu and Shikoku.
-
E.
Irabu Ohashi Bridge
Irabu Ohashi Bridge is a long sea-crossing bridge in Okinawa Prefecture, Japan, known for connecting Miyako-jima and Irabu-jima and offering scenic views over clear blue waters.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
railway tunnel
ⓘ
road tunnel ⓘ transport infrastructure ⓘ undersea tunnel ⓘ |
| bodyOfWater | Kanmon Straits ⓘ |
| connects |
Honshu
ⓘ
Kyushu ⓘ Moji-ku NERFINISHED ⓘ Shimonoseki ⓘ island of Honshu ⓘ
linked to:
Honshu
island of Kyushu ⓘ
linked to:
Kyushu
|
| constructionMaterial |
concrete
ⓘ
steel ⓘ |
| constructionType | subsea tunnel ⓘ |
| country | Japan ⓘ |
| crosses | strait ⓘ |
| gauge | 1,067 mm ⓘ |
| hasLaneCount | 2 (road tunnel, one each direction) ⓘ |
| hasPart |
Kanmon Railway Tunnel
ⓘ
linked to:
Kanmon Tunnel
Kanmon Road Tunnel ⓘ
linked to:
Kanmon Tunnel
|
| hasToll | yes (road section) ⓘ |
| languageOfName | Japanese ⓘ |
| length |
approximately 3.5 km
ⓘ
approximately 3.6 km ⓘ |
| locatedIn |
Fukuoka Prefecture
ⓘ
Kanmon Straits ⓘ Kitakyushu ⓘ Shimonoseki ⓘ Yamaguchi Prefecture NERFINISHED ⓘ |
| namedAfter | Kanmon Straits ⓘ |
| opened |
1942
ⓘ
1958 ⓘ |
| operator |
Japan Railway Group
ⓘ
linked to:
Japan Railways Group
NEXCO West Japan ⓘ |
| owner | Government of Japan ⓘ |
| partOf | Sanyō Main Line NERFINISHED ⓘ |
| railTracks | double track ⓘ |
| region |
Chūgoku region
ⓘ
Kyushu region ⓘ
linked to:
Kyushu
|
| significance | first undersea railway tunnel in Japan ⓘ |
| status | in use ⓘ |
| trafficType |
rail
ⓘ
road ⓘ |
| under | Kanmon Straits ⓘ |
| usedFor |
freight transport
ⓘ
passenger transport ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Kanmon Tunnel Description of subject: The Kanmon Tunnel is an undersea railway and road tunnel in Japan that links the islands of Honshu and Kyushu beneath the Kanmon Straits.
Referenced by (9)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject linked to:
western Japan
linked to: Kanmon Tunnel
linked to: Kanmon Tunnel
linked to: Kanmon Tunnel
linked to: Kanmon Tunnel
linked to: Kanmon Tunnel
linked to: Kanmon Tunnel
linked to: Kanmon Tunnel