Lake Okutama
E749544
Lake Okutama is a man-made reservoir in western Tokyo, Japan, known for its scenic mountain surroundings and role as a major source of the city’s drinking water.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Lake Okutama canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T8627336 — 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: Lake Okutama Context triple: [Okutama, hasLake, Lake Okutama]
-
A.
Lake Motosu
Lake Motosu is one of the Fuji Five Lakes in Yamanashi Prefecture, Japan, renowned for its clear deep waters and iconic views of Mount Fuji reflected on its surface.
-
B.
Lake Yamanaka
Lake Yamanaka is the largest of the Fuji Five Lakes in Japan, known for its scenic views of Mount Fuji and popularity as a resort and recreational area.
-
C.
Lake Tanuki
Lake Tanuki is a scenic artificial lake in Fujinomiya, Shizuoka Prefecture, Japan, renowned for its views of Mount Fuji and popular for camping, fishing, and seasonal festivals.
-
D.
Lake Haruna
Lake Haruna is a scenic crater lake in Gunma Prefecture, Japan, known for its tranquil waters, surrounding volcanic landscapes, and popularity as a recreational and tourist destination.
-
E.
Oguta Lake
Oguta Lake is a scenic natural freshwater lake in southeastern Nigeria known for its recreational activities, cultural significance, and picturesque surroundings.
- 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: Lake Okutama Target entity description: Lake Okutama is a man-made reservoir in western Tokyo, Japan, known for its scenic mountain surroundings and role as a major source of the city’s drinking water.
-
A.
Lake Motosu
Lake Motosu is one of the Fuji Five Lakes in Yamanashi Prefecture, Japan, renowned for its clear deep waters and iconic views of Mount Fuji reflected on its surface.
-
B.
Lake Yamanaka
Lake Yamanaka is the largest of the Fuji Five Lakes in Japan, known for its scenic views of Mount Fuji and popularity as a resort and recreational area.
-
C.
Lake Tanuki
Lake Tanuki is a scenic artificial lake in Fujinomiya, Shizuoka Prefecture, Japan, renowned for its views of Mount Fuji and popular for camping, fishing, and seasonal festivals.
-
D.
Lake Haruna
Lake Haruna is a scenic crater lake in Gunma Prefecture, Japan, known for its tranquil waters, surrounding volcanic landscapes, and popularity as a recreational and tourist destination.
-
E.
Oguta Lake
Oguta Lake is a scenic natural freshwater lake in southeastern Nigeria known for its recreational activities, cultural significance, and picturesque surroundings.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf | reservoir ⓘ |
| accessibleFrom | Okutama Station NERFINISHED ⓘ |
| basinCountry | Japan NERFINISHED ⓘ |
| connectedByRoad | Tokyo Metropolitan Route 411 NERFINISHED ⓘ |
| country | Japan ⓘ |
| created | 1950s ⓘ |
| createdBy | Tokyo Metropolitan Government NERFINISHED ⓘ |
| formedByDam | Ogouchi Dam NERFINISHED ⓘ |
| hasJapaneseName | 奥多摩湖 NERFINISHED ⓘ |
| hasMaximumDepth | over 140 meters ⓘ |
| hasNearbyAttraction |
Mugiyama Suspension Bridge
NERFINISHED
ⓘ
Nippara Limestone Caves NERFINISHED ⓘ Okutama Mukashi-michi trail NERFINISHED ⓘ |
| hasShoreLength | approximately 45 kilometers ⓘ |
| hasSurfaceArea | approximately 4.25 square kilometers ⓘ |
| inflow |
Kosuge River
NERFINISHED
ⓘ
Tama River NERFINISHED ⓘ |
| knownFor |
autumn foliage views
ⓘ
proximity to nature near Tokyo ⓘ recreational hiking ⓘ scenic mountain surroundings ⓘ |
| locatedIn |
Chichibu-Tama-Kai National Park
NERFINISHED
ⓘ
Tokyo ⓘ western Tokyo NERFINISHED ⓘ |
| locatedInAdministrativeTerritory |
Okutama, Tokyo
NERFINISHED
ⓘ
Tabayama, Yamanashi Prefecture NERFINISHED ⓘ |
| locatedInMountainRange | Okuchichibu Mountains NERFINISHED ⓘ |
| locatedInRegion | Kantō region NERFINISHED ⓘ |
| locatedNear | border of Tokyo and Yamanashi Prefecture ⓘ |
| locatedOn | Tama River system NERFINISHED ⓘ |
| locatedWestOf | central Tokyo ⓘ |
| majorWaterSourceFor |
Tokyo
NERFINISHED
ⓘ
Tokyo Metropolis NERFINISHED ⓘ |
| nameLanguage | Japanese ⓘ |
| outflow | Tama River NERFINISHED ⓘ |
| partOf | Tokyo water supply system ⓘ |
| purpose |
flood control
ⓘ
hydroelectric power generation ⓘ municipal water supply ⓘ |
| reservoirFor | Ogouchi Dam NERFINISHED ⓘ |
| usedFor |
boating
ⓘ
drinking water supply ⓘ fishing ⓘ recreation ⓘ |
| watercourse | Tama River NERFINISHED ⓘ |
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: Lake Okutama Description of subject: Lake Okutama is a man-made reservoir in western Tokyo, Japan, known for its scenic mountain surroundings and role as a major source of the city’s drinking water.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.