Lake Mashu
E381297
Lake Mashu is a deep, exceptionally clear caldera lake in eastern Hokkaido, Japan, renowned for its scenic beauty and often described as one of the clearest lakes in the world.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Lake Mashu canonical | 10 |
How this entity was disambiguated
This entity first appeared as the object of triple T3629405 — 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 Mashu Context triple: [Akan-Mashu National Park, hasPart, Lake Mashu]
-
A.
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.
-
B.
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.
-
C.
Lake Inari
Lake Inari is a large Arctic lake in northern Finland, renowned for its rugged natural beauty and cultural significance to the Indigenous Sámi people.
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D.
Lake Shoji
Lake Shoji is one of the Fuji Five Lakes in Japan, known for its tranquil waters and scenic views of Mount Fuji.
-
E.
Kakagi Lake
Kakagi Lake is a scenic freshwater lake in northwestern Ontario, Canada, known for its clear waters, rugged islands, and excellent fishing and outdoor recreation opportunities.
- 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 Mashu Target entity description: Lake Mashu is a deep, exceptionally clear caldera lake in eastern Hokkaido, Japan, renowned for its scenic beauty and often described as one of the clearest lakes in the world.
-
A.
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.
-
B.
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.
-
C.
Lake Inari
Lake Inari is a large Arctic lake in northern Finland, renowned for its rugged natural beauty and cultural significance to the Indigenous Sámi people.
-
D.
Lake Shoji
Lake Shoji is one of the Fuji Five Lakes in Japan, known for its tranquil waters and scenic views of Mount Fuji.
-
E.
Kakagi Lake
Kakagi Lake is a scenic freshwater lake in northwestern Ontario, Canada, known for its clear waters, rugged islands, and excellent fishing and outdoor recreation opportunities.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
caldera lake
ⓘ
lake ⓘ |
| accessRestrictedToShore | true ⓘ |
| alsoKnownAs | Mashū-ko ⓘ |
| basinCountry | Japan ⓘ |
| clarityRanking | among the clearest lakes in the world ⓘ |
| country | Japan ⓘ |
| frozenInWinter | sometimes partially frozen ⓘ |
| geologicalOrigin | volcanic caldera collapse ⓘ |
| hasClimate | humid continental climate surroundings ⓘ |
| hasInflow |
groundwater
ⓘ
precipitation ⓘ |
| hasIsland | Kamui Island NERFINISHED ⓘ |
| hasNoLargeRiversFlowingIn | true ⓘ |
| hasNoSettlementOnShore | true ⓘ |
| hasOutflow | none (endorheic lake) ⓘ |
| hasViewpoint |
Observation Deck No. 1
ⓘ
Observation Deck No. 3 ⓘ Uramashu Observatory ⓘ |
| isPartOfTouristRoute | Eastern Hokkaido sightseeing route ⓘ |
| knownFor |
exceptional water clarity
ⓘ
frequent fog and mist ⓘ scenic beauty ⓘ steep surrounding caldera walls ⓘ |
| locatedIn |
Hokkaido
ⓘ
eastern Hokkaido ⓘ |
| locatedInCalderaOf | Mashu volcano ⓘ |
| locatedInMunicipality | Teshikaga NERFINISHED ⓘ |
| locatedInProtectedArea | Akan-Mashu National Park ⓘ |
| locatedNear | Teshikaga, Hokkaido ⓘ |
| locatedOnIsland | Hokkaido ⓘ |
| maximumDepth | approximately 211 meters ⓘ |
| nameInJapanese | 摩周湖 ⓘ |
| nearbyAttraction |
Lake Kussharo
ⓘ
Mount Mashu ⓘ |
| partOf | Akan volcanic complex ⓘ |
| partOfEcosystem | Akan-Mashu volcanic lake system ⓘ |
| protectedFor |
landscape conservation
ⓘ
water quality preservation ⓘ |
| region | Kushiro Subprefecture ⓘ |
| surfaceElevation | approximately 351 meters above sea level ⓘ |
| surroundedBy | forested caldera rim ⓘ |
| tourismType |
nature tourism
ⓘ
sightseeing ⓘ |
| visibilityRecord |
historical measurements up to about 40 meters
ⓘ
underwater visibility exceeding 30 meters ⓘ |
| waterType | freshwater ⓘ |
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 Mashu Description of subject: Lake Mashu is a deep, exceptionally clear caldera lake in eastern Hokkaido, Japan, renowned for its scenic beauty and often described as one of the clearest lakes in the world.
Referenced by (10)
Full triples — surface form annotated when it differs from this entity's canonical label.