Clywedog Reservoir
E457195
Clywedog Reservoir is a large man-made lake in mid-Wales, created for water regulation and recreation amid scenic upland surroundings.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Clywedog Dam | 2 |
| Clywedog Reservoir canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4628505 — 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: Clywedog Reservoir Context triple: [Llanidloes, hasNearbyReservoir, Clywedog Reservoir]
-
A.
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.
-
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.
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.
Ladybower Reservoir
Ladybower Reservoir is a large Y-shaped drinking-water reservoir in the Upper Derwent Valley of Derbyshire, England, known for its distinctive plughole spillways and surrounding Peak District scenery.
-
E.
Llyn Celyn
Llyn Celyn is a large reservoir in North Wales, created in the 1960s by flooding the Tryweryn Valley, including the village of Capel Celyn, to supply water to Liverpool.
- 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: Clywedog Reservoir Target entity description: Clywedog Reservoir is a large man-made lake in mid-Wales, created for water regulation and recreation amid scenic upland surroundings.
-
A.
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.
-
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.
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.
Ladybower Reservoir
Ladybower Reservoir is a large Y-shaped drinking-water reservoir in the Upper Derwent Valley of Derbyshire, England, known for its distinctive plughole spillways and surrounding Peak District scenery.
-
E.
Llyn Celyn
Llyn Celyn is a large reservoir in North Wales, created in the 1960s by flooding the Tryweryn Valley, including the village of Capel Celyn, to supply water to Liverpool.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
man-made lake
ⓘ
reservoir ⓘ |
| basinCountry |
United Kingdom
ⓘ
Wales ⓘ |
| country | Wales ⓘ |
| createdBy |
Clywedog Dam
ⓘ
linked to:
Clywedog Reservoir
|
| hasActivity | trout fishing ⓘ |
| hasClub | Clywedog Sailing Club ⓘ |
| hasFeature |
car parks
ⓘ
forested slopes ⓘ viewpoints ⓘ |
| hasNearbySettlement |
Bryn Tail
ⓘ
Llanidloes ⓘ Staylittle ⓘ |
| hasRecreationFacility |
picnic sites
ⓘ
waymarked trails ⓘ |
| hasStructure |
Clywedog Dam
ⓘ
linked to:
Clywedog Reservoir
|
| hasWildlife |
migratory birds
ⓘ
trout ⓘ upland bird species ⓘ |
| inflow |
Afon Clywedog
ⓘ
linked to:
River Clywedog
|
| isPartOf | River Severn catchment ⓘ |
| landUse |
recreation
ⓘ
water resource management ⓘ |
| locatedIn |
Powys
ⓘ
Severn River Basin District ⓘ mid-Wales ⓘ |
| locatedInProtectedArea | Cambrian Mountains Environmentally Sensitive Area ⓘ |
| locatedNear | Llanidloes ⓘ |
| managingAgency | Severn Trent Water ⓘ |
| outflow |
River Severn
ⓘ
linked to:
Severn
|
| purpose |
flood control
ⓘ
recreation ⓘ river regulation ⓘ water supply support ⓘ |
| region | Montgomeryshire ⓘ |
| regulates |
River Severn
ⓘ
linked to:
Severn
|
| river |
Afon Clywedog
ⓘ
linked to:
River Clywedog
|
| scenicSetting |
Cambrian Mountains area
ⓘ
linked to:
Cambrian Mountains
upland landscape ⓘ |
| usedFor |
angling
ⓘ
sailing ⓘ walking ⓘ wildlife watching ⓘ |
| waterBodyType | freshwater lake ⓘ |
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: Clywedog Reservoir Description of subject: Clywedog Reservoir is a large man-made lake in mid-Wales, created for water regulation and recreation amid scenic upland surroundings.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Clywedog Reservoir
linked to: Clywedog Reservoir