Iōjima
E149271
Iōjima, more widely known as Iwo Jima, is a small volcanic island in the Pacific Ocean famous as the site of a major World War II battle between Japan and the United States.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Iōjima canonical | 4 |
How this entity was disambiguated
This entity first appeared as the object of triple T963063 — 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: Iōjima Context triple: [Iwo Jima, alsoKnownAs, Iōjima]
-
A.
Etajima Island
Etajima Island is a Japanese island in Hiroshima Prefecture best known as the historic site of the former Imperial Japanese Naval Academy.
-
B.
Yumeshima
Yumeshima is a large artificial island in Osaka, Japan, known for planned large-scale developments including expo and integrated resort projects.
-
C.
Rokkō Island
Rokkō Island is a large man-made island in Kobe, Japan, known for its residential areas, commercial facilities, and port-related infrastructure in Osaka Bay.
-
D.
Kish Island
Kish Island is a popular Iranian resort island and free trade zone in the Persian Gulf, known for its beaches, shopping centers, and tourism facilities.
-
E.
Chamisso Island
Chamisso Island is a small island in the Chukchi Sea off the coast of Alaska, known for its rich Arctic wildlife and designation as part of the Chukchi Sea unit of the Alaska Maritime National Wildlife Refuge.
- 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: Iōjima Target entity description: Iōjima, more widely known as Iwo Jima, is a small volcanic island in the Pacific Ocean famous as the site of a major World War II battle between Japan and the United States.
-
A.
Etajima Island
Etajima Island is a Japanese island in Hiroshima Prefecture best known as the historic site of the former Imperial Japanese Naval Academy.
-
B.
Yumeshima
Yumeshima is a large artificial island in Osaka, Japan, known for planned large-scale developments including expo and integrated resort projects.
-
C.
Rokkō Island
Rokkō Island is a large man-made island in Kobe, Japan, known for its residential areas, commercial facilities, and port-related infrastructure in Osaka Bay.
-
D.
Kish Island
Kish Island is a popular Iranian resort island and free trade zone in the Persian Gulf, known for its beaches, shopping centers, and tourism facilities.
-
E.
Chamisso Island
Chamisso Island is a small island in the Chukchi Sea off the coast of Alaska, known for its rich Arctic wildlife and designation as part of the Chukchi Sea unit of the Alaska Maritime National Wildlife Refuge.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
former municipality of Japan
ⓘ
island ⓘ volcanic island ⓘ |
| administeredBy | Japan Ministry of Defense ⓘ |
| alsoKnownAs |
Iwo Jima
ⓘ
Iō-tō ⓘ Sulfur Island ⓘ
surface form:
硫黄島
|
| area |
about 21 square kilometres
ⓘ
about 8.1 square miles ⓘ |
| capturedBy | United States Armed Forces in 1945 ⓘ |
| climate | humid subtropical climate ⓘ |
| country | Japan ⓘ |
| defendedBy | Imperial Japanese Army in 1945 ⓘ |
| distanceFrom |
about 1200 kilometres south of Tokyo
ⓘ
about 1250 kilometres from Okinawa ⓘ about 750 miles south of Tokyo ⓘ |
| elevation |
169 metres
ⓘ
554 feet ⓘ |
| eventDate | Battle of Iwo Jima 1945 ⓘ |
| eventLocation | Battle of Iwo Jima ⓘ |
| famousFor | Battle of Iwo Jima ⓘ |
| formerName | Iōjima self-link ⓘ |
| geologicalType | stratovolcano ⓘ |
| governedBy |
Japan Air Self-Defense Force
ⓘ
Japan Maritime Self-Defense Force ⓘ |
| hasFeature |
Mount Suribachi
ⓘ
active volcano ⓘ |
| hasLanguage | Japanese ⓘ |
| hasMemorial | Iwo Jima Memorials in Japan and the United States ⓘ |
| hasRunway | Iwo Jima Air Base ⓘ |
| hasUse | military base ⓘ |
| highestPoint | Mount Suribachi ⓘ |
| involvedIn | World War II ⓘ |
| locatedIn |
Eastern Hemisphere
ⓘ
Northern Hemisphere ⓘ Ogasawara Islands ⓘ
surface form:
Ogasawara Archipelago
Pacific Ocean ⓘ Philippine Sea ⓘ Volcano Islands ⓘ |
| nameChangedTo | Iō-tō in 2007 ⓘ |
| nameMeaning | Sulfur Island NERFINISHED ⓘ |
| partOf |
Ogasawara Subprefecture
ⓘ
Tokyo metropolitan area ⓘ
surface form:
Tokyo Metropolis
|
| population | no permanent civilian population ⓘ |
| strategicImportance | airfields for operations against Japan ⓘ |
| symbolizedBy |
Raising the Flag on Iwo Jima
ⓘ
surface form:
Raising the Flag on Iwo Jima photograph
|
| timeZone | Japan Standard Time ⓘ |
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: Iōjima Description of subject: Iōjima, more widely known as Iwo Jima, is a small volcanic island in the Pacific Ocean famous as the site of a major World War II battle between Japan and the United States.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.