Taf Fechan Reservoir
E713344
Taf Fechan Reservoir is a man-made lake in the Brecon Beacons of South Wales, constructed to supply drinking water and now also valued for its scenic surroundings and outdoor recreation.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Taf Fechan Reservoir canonical | 1 |
| Taff Fawr reservoir system | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T8045395 — 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: Taf Fechan Reservoir Context triple: [Taf Fechan, hasStructure, Taf Fechan Reservoir]
-
A.
Clywedog Reservoir
Clywedog Reservoir is a large man-made lake in mid-Wales, created for water regulation and recreation amid scenic upland surroundings.
-
B.
Garreg Ddu Reservoir
Garreg Ddu Reservoir is a scenic man-made lake in the Elan Valley of mid-Wales, known for its distinctive submerged dam and role in supplying water to the city of Birmingham.
-
C.
Claerwen Reservoir
Claerwen Reservoir is a large upland water reservoir in mid Wales, known for its impressive dam and scenic surroundings within the Elan Valley.
-
D.
Pen-y-garreg Reservoir
Pen-y-garreg Reservoir is a scenic man-made lake in the Elan Valley of mid Wales, known for its historic stone dam and role in the region’s water supply system.
-
E.
Bonaly Reservoir
Bonaly Reservoir is a man-made upland water body in the Pentland Hills near Edinburgh, popular for walking, wildlife, 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: Taf Fechan Reservoir Target entity description: Taf Fechan Reservoir is a man-made lake in the Brecon Beacons of South Wales, constructed to supply drinking water and now also valued for its scenic surroundings and outdoor recreation.
-
A.
Clywedog Reservoir
Clywedog Reservoir is a large man-made lake in mid-Wales, created for water regulation and recreation amid scenic upland surroundings.
-
B.
Garreg Ddu Reservoir
Garreg Ddu Reservoir is a scenic man-made lake in the Elan Valley of mid-Wales, known for its distinctive submerged dam and role in supplying water to the city of Birmingham.
-
C.
Claerwen Reservoir
Claerwen Reservoir is a large upland water reservoir in mid Wales, known for its impressive dam and scenic surroundings within the Elan Valley.
-
D.
Pen-y-garreg Reservoir
Pen-y-garreg Reservoir is a scenic man-made lake in the Elan Valley of mid Wales, known for its historic stone dam and role in the region’s water supply system.
-
E.
Bonaly Reservoir
Bonaly Reservoir is a man-made upland water body in the Pentland Hills near Edinburgh, popular for walking, wildlife, and scenic views.
- F. None of above. chosen
Statements (31)
| Predicate | Object |
|---|---|
| instanceOf | reservoir ⓘ |
| basinCountry | United Kingdom ⓘ |
| country | Wales ⓘ |
| environmentalSignificance |
habitat for upland bird species
ⓘ
part of regional water catchment ⓘ |
| hasAccess |
minor roads
ⓘ
public footpaths ⓘ |
| hasActivity |
angling
ⓘ
birdwatching ⓘ picnicking ⓘ |
| hasFeature | dam ⓘ |
| locatedIn |
Brecon Beacons
ⓘ
linked to:
Brecon Beacons in Wales
South Wales ⓘ Taf Fechan Forest ⓘ |
| locatedInProtectedArea |
Brecon Beacons National Park
ⓘ
linked to:
Bannau Brycheiniog National Park
|
| locatedOn | Taf Fechan valley ⓘ |
| managedBy | Dŵr Cymru Welsh Water ⓘ |
| near |
Brecon Mountain Railway
ⓘ
Merthyr Tydfil ⓘ Pontsticill Reservoir ⓘ |
| partOf | Taf Fechan water supply system ⓘ |
| purpose | drinking water supply ⓘ |
| region | Powys ⓘ |
| surroundedBy |
coniferous woodland
ⓘ
mountain scenery ⓘ upland moorland ⓘ |
| use |
hiking
ⓘ
outdoor recreation ⓘ scenic enjoyment ⓘ walking ⓘ |
| watercourse | River Taf Fechan ⓘ |
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: Taf Fechan Reservoir Description of subject: Taf Fechan Reservoir is a man-made lake in the Brecon Beacons of South Wales, constructed to supply drinking water and now also valued for its scenic surroundings and outdoor recreation.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Taf Fechan Reservoir