Llyn y Fan Fach
E684416
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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Llyn y Fan Fach canonical | 8 |
How this entity was disambiguated
This entity first appeared as the object of triple T7718723 — 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 Fach Context triple: [Black Mountain (Brecon Beacons), contains, Llyn y Fan Fach]
-
A.
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.
-
B.
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.
-
C.
Llyn Dinas
Llyn Dinas is a scenic natural lake in the Snowdonia region of North Wales, popular for walking, photography, and its surrounding mountainous landscapes.
-
D.
Llyn Llydaw
Llyn Llydaw is a glacial lake on the eastern flanks of Snowdon in Snowdonia National Park, Wales, renowned for its scenic mountain setting and association with local legends.
-
E.
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.
- 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 Fach Target entity description: 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.
-
A.
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.
-
B.
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.
-
C.
Llyn Dinas
Llyn Dinas is a scenic natural lake in the Snowdonia region of North Wales, popular for walking, photography, and its surrounding mountainous landscapes.
-
D.
Llyn Llydaw
Llyn Llydaw is a glacial lake on the eastern flanks of Snowdon in Snowdonia National Park, Wales, renowned for its scenic mountain setting and association with local legends.
-
E.
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.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf | glacial lake ⓘ |
| associatedWith |
Lady of the Lake (Welsh legend)
ⓘ
linked to:
The Lady of the Lake
Mab y Llyn (the lake’s son) legend ⓘ Physician of Myddfai legend ⓘ |
| country | Wales ⓘ |
| drainsInto | Afon Sawdde ⓘ |
| elevation | approximately 510 metres above sea level ⓘ |
| formedBy | glacial processes ⓘ |
| geologicalType | Old Red Sandstone escarpment surroundings ⓘ |
| hasAccess | track from Llanddeusant ⓘ |
| hasConservationStatus | within national park designation ⓘ |
| hasFeature |
glacial cirque
ⓘ
steep north-facing escarpment ⓘ |
| hasFolkloreTheme |
fairy bride motif
ⓘ
magical cattle origin story ⓘ |
| hasLanguageContext | Welsh ⓘ |
| hasMountainBackdrop | Bannau Sir Gâr ⓘ |
| hasNearbySettlement | Llanddeusant ⓘ |
| hasOutflow | Afon Sawdde ⓘ |
| hasRecreationRoute | circuit of the lake and surrounding ridges ⓘ |
| inProtectedArea |
Brecon Beacons National Park
ⓘ
linked to:
Bannau Brycheiniog National Park
Fforest Fawr Geopark ⓘ
linked to:
Bannau Brycheiniog National Park
|
| knownFor |
Welsh folklore
ⓘ
dramatic mountain scenery ⓘ legend of the Lady of the Lake ⓘ remote location ⓘ |
| locatedIn |
Black Mountain (Carmarthenshire)
ⓘ
linked to:
Black Mountain (Wales)
Brecon Beacons ⓘ
linked to:
Brecon Beacons in Wales
Brecon Beacons National Park ⓘ
linked to:
Bannau Brycheiniog National Park
Carmarthenshire ⓘ Fforest Fawr Geopark ⓘ
linked to:
Bannau Brycheiniog National Park
United Kingdom ⓘ |
| nameMeaning | Lake of the Small Beacon Hill ⓘ |
| overlookedBy |
Fan Brycheiniog
ⓘ
Picws Du ⓘ Waun Lefrith ⓘ |
| partOf |
Black Mountain range
ⓘ
linked to:
Black Mountains
Carmarthenshire uplands ⓘ River Towy catchment ⓘ |
| popularWith |
folklore enthusiasts
ⓘ
photographers ⓘ walkers ⓘ |
| region | South Wales ⓘ |
| usedFor |
angling
ⓘ
hiking ⓘ walking ⓘ wildlife observation ⓘ |
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 Fach Description of subject: 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.
Referenced by (8)
Full triples — surface form annotated when it differs from this entity's canonical label.