Llyn y Fan Fawr
E685735
Llyn y Fan Fawr is a glacial lake in the Brecon Beacons National Park in Wales, known for its scenic mountain setting beneath the Black Mountain range.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Llyn y Fan Fawr canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7718724 — 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: Llyn y Fan Fawr Context triple: [Black Mountain (Brecon Beacons), contains, Llyn y Fan Fawr]
-
A.
Llyn y Fan Fach
Llyn y Fan Fach is a remote glacial lake in the Brecon Beacons National Park in Wales, famed for its dramatic mountain backdrop and the Welsh legend of the Lady of the Lake.
-
B.
Llyn Trawsfynydd
Llyn Trawsfynydd is a large man-made reservoir in Gwynedd, Wales, originally constructed to supply cooling water for the now-decommissioned Trawsfynydd nuclear power station and now used for recreation and fishing.
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C.
Llyn Arenig Fawr
Llyn Arenig Fawr is a remote upland lake in Snowdonia, Wales, known for its scenic setting beneath the summit of Arenig Fawr and its use as a reservoir.
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D.
Llyn Tegid
Llyn Tegid, also known as Bala Lake, is the largest natural lake in Wales, renowned for its scenic beauty and unique aquatic wildlife.
-
E.
Llyn Hywel
Llyn Hywel is a remote mountain lake in the Rhinogydd range of Snowdonia, Wales, known for its dramatic rocky surroundings and scenic views.
- 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: Llyn y Fan Fawr Target entity description: Llyn y Fan Fawr is a glacial lake in the Brecon Beacons National Park in Wales, known for its scenic mountain setting beneath the Black Mountain range.
-
A.
Llyn y Fan Fach
Llyn y Fan Fach is a remote glacial lake in the Brecon Beacons National Park in Wales, famed for its dramatic mountain backdrop and the Welsh legend of the Lady of the Lake.
-
B.
Llyn Trawsfynydd
Llyn Trawsfynydd is a large man-made reservoir in Gwynedd, Wales, originally constructed to supply cooling water for the now-decommissioned Trawsfynydd nuclear power station and now used for recreation and fishing.
-
C.
Llyn Arenig Fawr
Llyn Arenig Fawr is a remote upland lake in Snowdonia, Wales, known for its scenic setting beneath the summit of Arenig Fawr and its use as a reservoir.
-
D.
Llyn Tegid
Llyn Tegid, also known as Bala Lake, is the largest natural lake in Wales, renowned for its scenic beauty and unique aquatic wildlife.
-
E.
Llyn Hywel
Llyn Hywel is a remote mountain lake in the Rhinogydd range of Snowdonia, Wales, known for its dramatic rocky surroundings and scenic views.
- F. None of above. chosen
Statements (44)
| Predicate | Object |
|---|---|
| instanceOf | glacial lake ⓘ |
| access | footpaths from Tafarn-y-Garreg area ⓘ |
| adjacentTo | Fan Brycheiniog ridge path ⓘ |
| category |
Brecon Beacons geography
ⓘ
Glacial lakes of Wales ⓘ Lakes of Carmarthenshire ⓘ |
| climate | upland oceanic climate ⓘ |
| country | Wales ⓘ |
| drainageBasin | River Tawe basin ⓘ |
| ecosystem | upland freshwater ecosystem ⓘ |
| elevation | approximately 605 metres above sea level ⓘ |
| geologicalType | corrie lake ⓘ |
| hazard |
boggy ground around shore
ⓘ
rapidly changing weather ⓘ |
| knownFor |
remote upland location
ⓘ
scenic mountain setting ⓘ views of Fan Brycheiniog escarpment ⓘ |
| languageOfName | Welsh ⓘ |
| length | approximately 1 kilometre ⓘ |
| locatedAtBaseOf | Fan Brycheiniog NERFINISHED ⓘ |
| locatedIn |
Bannau Brycheiniog (Brecon Beacons)
NERFINISHED
ⓘ
Black Mountain (Carmarthenshire) area NERFINISHED ⓘ Brecon Beacons National Park NERFINISHED ⓘ Carmarthenshire NERFINISHED ⓘ South Wales NERFINISHED ⓘ United Kingdom ⓘ |
| locatedNear |
Fan Hir
NERFINISHED
ⓘ
Llyn y Fan Fach NERFINISHED ⓘ |
| nameMeaning | "lake of the big peak" in Welsh ⓘ |
| nearestMajorTown | Swansea (regionally) NERFINISHED ⓘ |
| origin | glacial erosion ⓘ |
| outflow | Afon Tawe headwaters ⓘ |
| partOf |
Black Mountain lake system
NERFINISHED
ⓘ
Carmarthen Fans area NERFINISHED ⓘ |
| protectedAreaStatus | within national park ⓘ |
| region | Brecon Beacons western area NERFINISHED ⓘ |
| shape | elongated ⓘ |
| surroundedBy |
peat moorland
ⓘ
sandstone escarpments ⓘ |
| tourism | popular with walkers and hillwalkers ⓘ |
| usedFor |
angling
ⓘ
hiking destination ⓘ wild 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: Llyn y Fan Fawr Description of subject: Llyn y Fan Fawr is a glacial lake in the Brecon Beacons National Park in Wales, known for its scenic mountain setting beneath the Black Mountain range.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Black Mountain (Brecon Beacons)