Tamagawa River
E930261
The Tamagawa River is a major river in the Tokyo and Kanagawa regions of Japan, known for its scenic banks, recreational areas, and role as a natural boundary within the Greater Tokyo Area.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Tamagawa River canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T10297017 — 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: Tamagawa River Context triple: [Setagaya, hasRiver, Tamagawa River]
-
A.
Yamato River
The Yamato River is a major river in Japan’s Kansai region that flows through Nara and Osaka Prefectures before emptying into Osaka Bay.
-
B.
Sagami River
The Sagami River is a major river in central Japan that flows through Yamanashi and Kanagawa Prefectures before reaching the Pacific Ocean.
-
C.
Sumida River
The Sumida River is a historically significant river flowing through central Tokyo, known for its scenic bridges, cherry blossoms, and cultural prominence in Japanese art and literature.
-
D.
Arakawa River
The Arakawa River is a major river in the Tokyo region of Japan, known for its extensive flood control systems and role in shaping the urban landscape.
-
E.
Shinano River
The Shinano River is Japan’s longest river, flowing through central Honshu before emptying into the Sea of Japan.
- 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: Tamagawa River Target entity description: The Tamagawa River is a major river in the Tokyo and Kanagawa regions of Japan, known for its scenic banks, recreational areas, and role as a natural boundary within the Greater Tokyo Area.
-
A.
Yamato River
The Yamato River is a major river in Japan’s Kansai region that flows through Nara and Osaka Prefectures before emptying into Osaka Bay.
-
B.
Sagami River
The Sagami River is a major river in central Japan that flows through Yamanashi and Kanagawa Prefectures before reaching the Pacific Ocean.
-
C.
Sumida River
The Sumida River is a historically significant river flowing through central Tokyo, known for its scenic bridges, cherry blossoms, and cultural prominence in Japanese art and literature.
-
D.
Arakawa River
The Arakawa River is a major river in the Tokyo region of Japan, known for its extensive flood control systems and role in shaping the urban landscape.
-
E.
Shinano River
The Shinano River is Japan’s longest river, flowing through central Honshu before emptying into the Sea of Japan.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf | river ⓘ |
| alternativeName | Tama River NERFINISHED ⓘ |
| basinSize | approximately 1240 square kilometers ⓘ |
| country | Japan ⓘ |
| crossedBy |
Maruko Bridge
NERFINISHED
ⓘ
Tamagawa Ohashi NERFINISHED ⓘ Tamagawa Railway Bridge NERFINISHED ⓘ |
| ecologicalRole | habitat for waterfowl and aquatic species ⓘ |
| emptiesInto | Tokyo Bay NERFINISHED ⓘ |
| flowsThrough |
Kanagawa Prefecture
NERFINISHED
ⓘ
Tokyo NERFINISHED ⓘ Yamanashi Prefecture NERFINISHED ⓘ |
| formsBorderBetween |
Kanagawa Prefecture
NERFINISHED
ⓘ
Tokyo NERFINISHED ⓘ |
| formsBoundaryWithin | Greater Tokyo Area NERFINISHED ⓘ |
| hasFacilityAlongBank | Tamagawa Josui (historic waterway nearby) NERFINISHED ⓘ |
| hasFeature |
levees along urban sections
ⓘ
multiple parks along its banks ⓘ wide river terraces ⓘ |
| hasTributary |
Asakawa
NERFINISHED
ⓘ
Hirase River NERFINISHED ⓘ Yoshino River (Tamagawa tributary) NERFINISHED ⓘ |
| JapaneseName | 多摩川 NERFINISHED ⓘ |
| knownFor |
baseball and soccer fields along its banks
ⓘ
cherry blossom viewing spots ⓘ cycling paths ⓘ recreational areas ⓘ scenic riverbanks ⓘ |
| length | approximately 138 kilometers ⓘ |
| locatedIn |
Kanagawa Prefecture
NERFINISHED
ⓘ
Tokyo ⓘ Yamanashi Prefecture NERFINISHED ⓘ |
| locatedNear | Haneda Airport NERFINISHED ⓘ |
| mouthLocatedIn |
Haneda area
NERFINISHED
ⓘ
Ota Ward NERFINISHED ⓘ Tokyo Bay NERFINISHED ⓘ |
| partOf | Tama River basin ⓘ |
| passesThrough |
Fussa
NERFINISHED
ⓘ
Hamura NERFINISHED ⓘ Kawasaki NERFINISHED ⓘ Komae NERFINISHED ⓘ Tachikawa NERFINISHED ⓘ Tama area of western Tokyo NERFINISHED ⓘ |
| region | Kanto region NERFINISHED ⓘ |
| sourceLocation |
Koshu, Yamanashi
NERFINISHED
ⓘ
Yamanashi Prefecture NERFINISHED ⓘ |
| usedFor |
flood control infrastructure
ⓘ
recreational fishing ⓘ rowing and boating ⓘ water supply for Tokyo ⓘ |
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: Tamagawa River Description of subject: The Tamagawa River is a major river in the Tokyo and Kanagawa regions of Japan, known for its scenic banks, recreational areas, and role as a natural boundary within the Greater Tokyo Area.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.