Nant-y-moch Reservoir
E797979
Nant-y-moch Reservoir is a large upland man-made lake in the Cambrian Mountains of mid Wales, known for hydroelectric power generation and its remote, scenic landscape.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Nant-y-moch Dam | 2 |
| Nant-y-Moch Reservoir | 1 |
| Nant-y-moch Reservoir canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T9410448 — 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: Nant-y-moch Reservoir Context triple: [Pumlumon, hasAccessPoint, Nant-y-moch Reservoir]
-
A.
Cantref Reservoir
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.
-
B.
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.
-
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.
Clywedog Reservoir
Clywedog Reservoir is a large man-made lake in mid-Wales, created for water regulation and recreation amid scenic upland surroundings.
-
E.
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.
- 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: Nant-y-moch Reservoir Target entity description: Nant-y-moch Reservoir is a large upland man-made lake in the Cambrian Mountains of mid Wales, known for hydroelectric power generation and its remote, scenic landscape.
-
A.
Cantref Reservoir
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.
-
B.
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.
-
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.
Clywedog Reservoir
Clywedog Reservoir is a large man-made lake in mid-Wales, created for water regulation and recreation amid scenic upland surroundings.
-
E.
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.
- F. None of above. chosen
Statements (44)
| Predicate | Object |
|---|---|
| instanceOf | reservoir ⓘ |
| access | minor mountain roads ⓘ |
| basinCountry | United Kingdom ⓘ |
| category |
Dams in Wales
ⓘ
Hydroelectric power stations in Wales ⓘ Reservoirs in Ceredigion ⓘ |
| constructionStart | 1950s ⓘ |
| country | Wales ⓘ |
| createdBy |
Nant-y-moch Dam
ⓘ
linked to:
Nant-y-moch Reservoir
|
| ecologicalImpact | inundation of upland valley ⓘ |
| environment |
moorland
ⓘ
mountainous terrain ⓘ |
| etymology | Welsh for "stream of the pigs" ⓘ |
| hasStructure |
Nant-y-moch Dam
ⓘ
linked to:
Nant-y-moch Reservoir
|
| hasType | impounding reservoir ⓘ |
| inflow |
Afon Leri tributaries
ⓘ
Nant-y-moch ⓘ |
| landscapeType | upland ⓘ |
| languageOfToponym | Welsh ⓘ |
| locatedIn |
Cambrian Mountains
ⓘ
Ceredigion ⓘ Rheidol valley catchment ⓘ mid Wales ⓘ
linked to:
Mid Wales
|
| locatedNear |
Aberystwyth
ⓘ
Ponterwyd ⓘ |
| managedBy | hydropower utility company ⓘ |
| nearFeature |
A44 road
NERFINISHED
ⓘ
Dylife mountain road ⓘ Pumlumon massif ⓘ |
| notableFor |
hydroelectric power generation
ⓘ
remote scenic landscape ⓘ |
| operator | Rheidol hydroelectric scheme ⓘ |
| outflow |
Afon Rheidol
ⓘ
linked to:
River Rheidol
|
| partOf | Rheidol hydroelectric scheme ⓘ |
| purpose |
hydroelectric power generation
ⓘ
water storage ⓘ |
| recreationalActivity |
angling
ⓘ
walking ⓘ wildlife observation ⓘ |
| region | Ceredigion ⓘ |
| usedFor |
electricity generation
ⓘ
flood control ⓘ recreation ⓘ |
| watercourse |
Afon Rheidol
ⓘ
linked to:
River Rheidol
|
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: Nant-y-moch Reservoir Description of subject: Nant-y-moch Reservoir is a large upland man-made lake in the Cambrian Mountains of mid Wales, known for hydroelectric power generation and its remote, scenic landscape.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Nant-y-moch Reservoir
linked to: Nant-y-moch Reservoir
linked to: Nant-y-moch Reservoir