Tryweryn Reservoir
E925952
Tryweryn Reservoir is an artificial lake in North Wales created in the 1960s to supply water to Liverpool, whose flooding of the village of Capel Celyn made it a lasting symbol of Welsh nationalist protest.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Tryweryn Reservoir canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T11427198 — 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: Tryweryn Reservoir Context triple: [Afon Tryweryn, knownFor, Tryweryn 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.
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.
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.
-
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.
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.
- 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: Tryweryn Reservoir Target entity description: Tryweryn Reservoir is an artificial lake in North Wales created in the 1960s to supply water to Liverpool, whose flooding of the village of Capel Celyn made it a lasting symbol of Welsh nationalist protest.
-
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.
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.
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.
-
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.
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.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
artificial lake
ⓘ
reservoir ⓘ |
| alsoKnownAs | Llyn Celyn ⓘ |
| associatedWith |
Plaid Cymru
ⓘ
Welsh language activism ⓘ |
| basinCountry |
United Kingdom
ⓘ
Wales ⓘ |
| causeOf | displacement of Capel Celyn residents ⓘ |
| constructionApprovedBy |
UK Parliament
ⓘ
linked to:
British Parliament
|
| constructionControversy | built despite opposition from Welsh MPs ⓘ |
| constructionStart | late 1950s ⓘ |
| country | Wales ⓘ |
| created | 1960s ⓘ |
| createdBy | Liverpool Corporation ⓘ |
| flooded |
Capel Celyn
ⓘ
farmland in Tryweryn Valley ⓘ |
| formedByDamming | Afon Tryweryn ⓘ |
| hasFeature | dam at western end ⓘ |
| hasFunction | maintaining flow in River Dee ⓘ |
| hasMemorial |
Capel Celyn memorial
ⓘ
linked to:
Capel Celyn memorial chapel at Llyn Celyn
|
| hasOutflow | Afon Tryweryn ⓘ |
| hasSloganAssociated | Cofiwch Dryweryn ⓘ |
| hasType | upland reservoir ⓘ |
| hasWelshName | Llyn Celyn ⓘ |
| impact | loss of Welsh-speaking community ⓘ |
| legislatedBy | Liverpool Corporation Act 1957 ⓘ |
| locatedIn |
Gwynedd
ⓘ
North Wales ⓘ Tryweryn Valley ⓘ historic county of Merionethshire ⓘ |
| locatedNear |
Bala
ⓘ
Snowdonia National Park ⓘ
linked to:
Eryri National Park
|
| managedBy | Dŵr Cymru Welsh Water ⓘ |
| near | National White Water Centre ⓘ |
| opened | 1965 ⓘ |
| partOf | River Dee water supply system ⓘ |
| politicalLegacy |
strengthening of Welsh devolution movement
ⓘ
“Cofiwch Dryweryn” slogan ⓘ
linked to:
Cofiwch Dryweryn mural
|
| primaryPurpose | water supply ⓘ |
| suppliesWaterTo | Liverpool ⓘ |
| symbolOf |
Welsh nationalism
ⓘ
Welsh nationalist protest ⓘ opposition to English control ⓘ |
| topicOf |
Welsh history studies
ⓘ
documentaries on Welsh nationalism ⓘ |
| usedFor |
flood control
ⓘ
recreation ⓘ water regulation ⓘ |
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: Tryweryn Reservoir Description of subject: Tryweryn Reservoir is an artificial lake in North Wales created in the 1960s to supply water to Liverpool, whose flooding of the village of Capel Celyn made it a lasting symbol of Welsh nationalist protest.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.