Cantref Reservoir
E707950
Cantref Reservoir is a man-made lake in the Brecon Beacons of South Wales that forms part of the water supply system for the city of Cardiff.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Cantref Reservoir canonical | 2 |
| Talybont Reservoir | 2 |
| Upper Neuadd Reservoir | 2 |
| Llwyn-on Reservoir | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7996235 — 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: Cantref Reservoir Context triple: [Taf Fawr, hasReservoir, Cantref Reservoir]
-
A.
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.
-
B.
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.
-
C.
Clywedog Reservoir
Clywedog Reservoir is a large man-made lake in mid-Wales, created for water regulation and recreation amid scenic upland surroundings.
-
D.
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.
-
E.
Urft Reservoir
Urft Reservoir is a historic artificial lake in Germany’s Eifel region, known for its early 20th-century dam and scenic setting within Eifel National Park.
- 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: Cantref Reservoir Target entity description: Cantref Reservoir is a man-made lake in the Brecon Beacons of South Wales that forms part of the water supply system for the city of Cardiff.
-
A.
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.
-
B.
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.
-
C.
Clywedog Reservoir
Clywedog Reservoir is a large man-made lake in mid-Wales, created for water regulation and recreation amid scenic upland surroundings.
-
D.
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.
-
E.
Urft Reservoir
Urft Reservoir is a historic artificial lake in Germany’s Eifel region, known for its early 20th-century dam and scenic setting within Eifel National Park.
- F. None of above. chosen
Statements (25)
| Predicate | Object |
|---|---|
| instanceOf | reservoir ⓘ |
| basinCountry | United Kingdom ⓘ |
| catchmentArea | River Taff catchment ⓘ |
| country | Wales ⓘ |
| environment | upland moorland surroundings ⓘ |
| hasAccess | minor roads from A470 ⓘ |
| hasFeature | earth embankment dam ⓘ |
| hasUse |
angling
ⓘ
recreational walking ⓘ |
| isPartOf | Cardiff water supply system ⓘ |
| locatedIn |
Brecon Beacons
ⓘ
linked to:
Brecon Beacons in Wales
Brecon Beacons National Park ⓘ
linked to:
Brecon Beacons in Wales
South Wales ⓘ Taff Fawr valley ⓘ
linked to:
Taf Fawr valley
|
| locatedNear |
Beacons Reservoir
ⓘ
Llwyn-on Reservoir ⓘ Merthyr Tydfil ⓘ |
| operator | Dŵr Cymru Welsh Water ⓘ |
| partOf | Taff Fawr reservoir system ⓘ |
| protectedArea |
Brecon Beacons National Park
ⓘ
linked to:
Brecon Beacons in Wales
|
| purpose |
drinking water storage
ⓘ
public water supply ⓘ |
| region | Powys ⓘ |
| suppliesWaterTo | Cardiff ⓘ |
| watercourse | River Taff ⓘ |
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: Cantref Reservoir Description of subject: Cantref Reservoir is a man-made lake in the Brecon Beacons of South Wales that forms part of the water supply system for the city of Cardiff.
Referenced by (7)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Cantref Reservoir
linked to: Cantref Reservoir
linked to: Cantref Reservoir
linked to: Cantref Reservoir
linked to: Cantref Reservoir