Ijen Crater Lake
E638404
Ijen Crater Lake is a highly acidic turquoise volcanic lake in East Java, Indonesia, famous for its sulfur mining and striking blue fire phenomena.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Ijen Crater | 1 |
| Ijen Crater Lake canonical | 1 |
| Mount Ijen crater lake | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7056846 — 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: Ijen Crater Lake Context triple: [Ijen Crater, hasLake, Ijen Crater Lake]
-
A.
Rano Kau crater lake
Rano Kau crater lake is a freshwater lake filling the vast volcanic crater of Rano Kau on Easter Island, notable for its steep cliffs, unique microclimate, and cultural significance to the Rapa Nui people.
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B.
Rano Aroi crater lake
Rano Aroi crater lake is a small, high-altitude volcanic crater lake on Easter Island known for its peat bogs and unique wetland ecosystem.
-
C.
Lake Toba
Lake Toba is a vast volcanic crater lake in northern Sumatra, Indonesia, renowned as one of the world’s largest and deepest volcanic lakes and a major natural and cultural tourism destination.
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D.
Boiling Lake
Boiling Lake is a famous flooded fumarole and one of the world’s largest hot lakes, located in the volcanic interior of Dominica.
-
E.
Lagoa Rasa
Lagoa Rasa is a small volcanic crater lake on Flores Island in Portugal’s Azores archipelago, known for its tranquil setting and lush surrounding landscapes.
- 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: Ijen Crater Lake Target entity description: Ijen Crater Lake is a highly acidic turquoise volcanic lake in East Java, Indonesia, famous for its sulfur mining and striking blue fire phenomena.
-
A.
Rano Kau crater lake
Rano Kau crater lake is a freshwater lake filling the vast volcanic crater of Rano Kau on Easter Island, notable for its steep cliffs, unique microclimate, and cultural significance to the Rapa Nui people.
-
B.
Rano Aroi crater lake
Rano Aroi crater lake is a small, high-altitude volcanic crater lake on Easter Island known for its peat bogs and unique wetland ecosystem.
-
C.
Lake Toba
Lake Toba is a vast volcanic crater lake in northern Sumatra, Indonesia, renowned as one of the world’s largest and deepest volcanic lakes and a major natural and cultural tourism destination.
-
D.
Boiling Lake
Boiling Lake is a famous flooded fumarole and one of the world’s largest hot lakes, located in the volcanic interior of Dominica.
-
E.
Lagoa Rasa
Lagoa Rasa is a small volcanic crater lake on Flores Island in Portugal’s Azores archipelago, known for its tranquil setting and lush surrounding landscapes.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
acidic lake
ⓘ
volcanic crater lake ⓘ |
| activity |
hiking
ⓘ
night trekking ⓘ sulfur extraction ⓘ |
| attracts |
domestic tourists
ⓘ
international tourists ⓘ |
| color | turquoise ⓘ |
| country | Indonesia ⓘ |
| geologicalSetting | subduction zone volcano ⓘ |
| hasChemical |
dissolved metals
ⓘ
hydrochloric acid ⓘ sulfuric acid ⓘ |
| hasEconomicActivity | artisanal sulfur mining ⓘ |
| hasFeature |
fumaroles
ⓘ
nighttime blue flames ⓘ steep crater walls ⓘ sulfur deposits ⓘ sulfur vents ⓘ volcanic gas emissions ⓘ |
| hasView |
sulfur clouds
ⓘ
sunrise over crater ⓘ turquoise crater water ⓘ |
| hasWorkers | sulfur miners ⓘ |
| knownFor |
blue fire phenomenon
ⓘ
high acidity ⓘ sulfur mining ⓘ volcanic activity ⓘ |
| languageRegion | Indonesian-speaking area ⓘ |
| locatedIn |
East Java
ⓘ
Ijen Plateau NERFINISHED ⓘ Ijen volcano complex NERFINISHED ⓘ Java ⓘ |
| locatedNear |
Banyuwangi
NERFINISHED
ⓘ
Bondowoso NERFINISHED ⓘ |
| partOf |
Ijen caldera
NERFINISHED
ⓘ
Pacific Ring of Fire ⓘ |
| pH | extremely low pH ⓘ |
| region | Southeast Asia ⓘ |
| risk |
acidic water hazard
ⓘ
toxic gas exposure ⓘ volcanic hazards ⓘ |
| tourismType |
adventure tourism site
ⓘ
volcano tourism destination ⓘ |
| volcanoType | stratovolcano crater lake ⓘ |
| waterType | acidic water ⓘ |
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: Ijen Crater Lake Description of subject: Ijen Crater Lake is a highly acidic turquoise volcanic lake in East Java, Indonesia, famous for its sulfur mining and striking blue fire phenomena.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Ijen Crater
subject surface form:
Ijen Crater
this entity surface form:
Mount Ijen crater lake