Tanygrisiau reservoir
E895549
Tanygrisiau Reservoir is a man-made mountain lake in Snowdonia, Wales, primarily serving hydroelectric power generation and located near the former slate-mining town of Blaenau Ffestiniog.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Tanygrisiau reservoir canonical | 2 |
| Tanygrisiau Reservoir | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T10944388 — 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: Tanygrisiau reservoir Context triple: [Blaenau Ffestiniog, hasNearbyReservoir, Tanygrisiau reservoir]
-
A.
Nant-y-moch Reservoir
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.
-
B.
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.
-
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.
Clywedog Reservoir
Clywedog Reservoir is a large man-made lake in mid-Wales, created for water regulation and recreation amid scenic upland surroundings.
- 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: Tanygrisiau reservoir Target entity description: Tanygrisiau Reservoir is a man-made mountain lake in Snowdonia, Wales, primarily serving hydroelectric power generation and located near the former slate-mining town of Blaenau Ffestiniog.
-
A.
Nant-y-moch Reservoir
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.
-
B.
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.
-
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.
Clywedog Reservoir
Clywedog Reservoir is a large man-made lake in mid-Wales, created for water regulation and recreation amid scenic upland surroundings.
- F. None of above. chosen
Statements (31)
| Predicate | Object |
|---|---|
| instanceOf |
hydroelectric reservoir
ⓘ
man-made lake ⓘ reservoir ⓘ |
| basinCountry |
United Kingdom
ⓘ
Wales ⓘ |
| category |
Hydroelectric power stations in Wales
ⓘ
Reservoirs in Gwynedd ⓘ Snowdonia ⓘ |
| country | Wales ⓘ |
| elevation | mountain lake ⓘ |
| fedBy | Afon Barlwyd ⓘ |
| hasFeature |
dam
ⓘ
mountain surroundings ⓘ |
| hasFunction | regulating water flow for power station ⓘ |
| locatedIn |
Gwynedd
ⓘ
Snowdonia ⓘ north-west Wales ⓘ |
| locatedNear |
Blaenau Ffestiniog
ⓘ
Tanygrisiau ⓘ |
| locatedOn | Afon Barlwyd ⓘ |
| managedBy | hydroelectric power operator ⓘ |
| nearbyIndustry | slate mining ⓘ |
| nearbyTown | Blaenau Ffestiniog ⓘ |
| nearbyTransport | Ffestiniog Railway ⓘ |
| outflow | Afon Barlwyd ⓘ |
| partOf |
Ffestiniog pumped-storage scheme
ⓘ
linked to:
Dinorwig Power Station
|
| primaryUse | hydroelectric power generation ⓘ |
| region |
Snowdonia National Park
ⓘ
linked to:
Eryri National Park
|
| usedFor |
electricity generation
ⓘ
water storage ⓘ |
| watercourse | Afon Barlwyd ⓘ |
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: Tanygrisiau reservoir Description of subject: Tanygrisiau Reservoir is a man-made mountain lake in Snowdonia, Wales, primarily serving hydroelectric power generation and located near the former slate-mining town of Blaenau Ffestiniog.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Tanygrisiau reservoir