Cwm Cau
E866450
Cwm Cau is a glacial cirque lake nestled beneath the summit cliffs of Cadair Idris in Snowdonia, Wales, known for its dramatic mountain scenery.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Cwm Cau canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T10313644 — 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: Cwm Cau Context triple: [Cadair Idris, hasFeature, Cwm Cau]
-
A.
Cwm Sere
Cwm Sere is a glacial valley in the Brecon Beacons of Wales, known for its dramatic mountain scenery beneath peaks such as Cribyn and Pen y Fan.
-
B.
Cwm Cynwyn
Cwm Cynwyn is a secluded glacial valley in the Brecon Beacons of Wales, known for its steep grassy slopes and dramatic mountain scenery.
-
C.
Cwm Gwdi
Cwm Gwdi is a popular upland car park and access point in the Brecon Beacons used as a starting base for hikes onto the central Beacons peaks.
-
D.
Cwm Oergwm
Cwm Oergwm is a glacial valley in the Brecon Beacons of Wales, known for its steep sides, remote feel, and scenic mountain surroundings.
-
E.
Cwm Bychan
Cwm Bychan is a remote valley in Snowdonia, Wales, known for its scenic lake, surrounding mountains, and access to historic routes like the Roman Steps.
- 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: Cwm Cau Target entity description: Cwm Cau is a glacial cirque lake nestled beneath the summit cliffs of Cadair Idris in Snowdonia, Wales, known for its dramatic mountain scenery.
-
A.
Cwm Sere
Cwm Sere is a glacial valley in the Brecon Beacons of Wales, known for its dramatic mountain scenery beneath peaks such as Cribyn and Pen y Fan.
-
B.
Cwm Cynwyn
Cwm Cynwyn is a secluded glacial valley in the Brecon Beacons of Wales, known for its steep grassy slopes and dramatic mountain scenery.
-
C.
Cwm Gwdi
Cwm Gwdi is a popular upland car park and access point in the Brecon Beacons used as a starting base for hikes onto the central Beacons peaks.
-
D.
Cwm Oergwm
Cwm Oergwm is a glacial valley in the Brecon Beacons of Wales, known for its steep sides, remote feel, and scenic mountain surroundings.
-
E.
Cwm Bychan
Cwm Bychan is a remote valley in Snowdonia, Wales, known for its scenic lake, surrounding mountains, and access to historic routes like the Roman Steps.
- F. None of above. chosen
Statements (38)
| Predicate | Object |
|---|---|
| instanceOf |
glacial cirque lake
ⓘ
tarn ⓘ |
| basinType | glacial basin ⓘ |
| below | summit cliffs of Cadair Idris ⓘ |
| category |
Glacial lakes of Wales
ⓘ
Lakes of Snowdonia NERFINISHED ⓘ Landforms of Gwynedd ⓘ |
| country | Wales ⓘ |
| etymology | Welsh word "cwm" meaning valley or cirque ⓘ |
| featureType | cirque ⓘ |
| formedDuring | Quaternary glaciations NERFINISHED ⓘ |
| geologicalOrigin | glacial erosion ⓘ |
| hasAccessFrom | Minffordd path ⓘ |
| hasFeature |
amphitheatre-shaped valley
ⓘ
rocky mountain scenery ⓘ steep surrounding cliffs ⓘ |
| hasReputationFor |
dramatic mountain scenery
ⓘ
rugged landscape ⓘ |
| isPartOf | Cadair Idris cwm system ⓘ |
| landform | glacial cirque ⓘ |
| languageRegion | Welsh-speaking area ⓘ |
| locatedIn |
Cadair Idris
NERFINISHED
ⓘ
Gwynedd NERFINISHED ⓘ Snowdonia NERFINISHED ⓘ United Kingdom ⓘ Wales ⓘ |
| mountainRange | Cadair Idris massif NERFINISHED ⓘ |
| nameLanguage | Welsh ⓘ |
| near | Penygadair NERFINISHED ⓘ |
| partOf | Snowdonia National Park NERFINISHED ⓘ |
| protectedArea | Snowdonia National Park NERFINISHED ⓘ |
| region | northwest Wales NERFINISHED ⓘ |
| surroundedBy | crags of Cadair Idris NERFINISHED ⓘ |
| topographicContext | north side of Cadair Idris summit ridge ⓘ |
| usedFor |
hiking destination
ⓘ
landscape photography ⓘ mountain walking ⓘ |
| 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: Cwm Cau Description of subject: Cwm Cau is a glacial cirque lake nestled beneath the summit cliffs of Cadair Idris in Snowdonia, Wales, known for its dramatic mountain scenery.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Llyn Cau