Lake Vyrnwy
E282361
Lake Vyrnwy is a large artificial reservoir in Powys, Wales, created in the 19th century to supply water to Liverpool and now known for its scenic surroundings and wildlife.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Lake Vyrnwy canonical | 4 |
| Lake Vyrnwy Reservoir | 1 |
| Lake Vyrnwy nature reserve | 1 |
| Lake Vyrnwy straining tower | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2318849 — 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: Lake Vyrnwy Context triple: [River Vyrnwy, flowsFrom, Lake Vyrnwy]
-
A.
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.
-
B.
River Vyrnwy
River Vyrnwy is a river in Wales and western England that flows from Lake Vyrnwy through Powys and Shropshire, contributing significantly to the River Severn catchment.
-
C.
Llyn Tegid
Llyn Tegid, also known as Bala Lake, is the largest natural lake in Wales, renowned for its scenic beauty and unique aquatic wildlife.
-
D.
Llyn Trawsfynydd
Llyn Trawsfynydd is a large man-made reservoir in Gwynedd, Wales, originally constructed to supply cooling water for the now-decommissioned Trawsfynydd nuclear power station and now used for recreation and fishing.
-
E.
Llyn Hywel
Llyn Hywel is a remote mountain lake in the Rhinogydd range of Snowdonia, Wales, known for its dramatic rocky surroundings and scenic views.
- 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: Lake Vyrnwy Target entity description: Lake Vyrnwy is a large artificial reservoir in Powys, Wales, created in the 19th century to supply water to Liverpool and now known for its scenic surroundings and wildlife.
-
A.
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.
-
B.
River Vyrnwy
River Vyrnwy is a river in Wales and western England that flows from Lake Vyrnwy through Powys and Shropshire, contributing significantly to the River Severn catchment.
-
C.
Llyn Tegid
Llyn Tegid, also known as Bala Lake, is the largest natural lake in Wales, renowned for its scenic beauty and unique aquatic wildlife.
-
D.
Llyn Trawsfynydd
Llyn Trawsfynydd is a large man-made reservoir in Gwynedd, Wales, originally constructed to supply cooling water for the now-decommissioned Trawsfynydd nuclear power station and now used for recreation and fishing.
-
E.
Llyn Hywel
Llyn Hywel is a remote mountain lake in the Rhinogydd range of Snowdonia, Wales, known for its dramatic rocky surroundings and scenic views.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
artificial lake
ⓘ
reservoir ⓘ tourist attraction ⓘ |
| basinCountry | United Kingdom ⓘ |
| completionDate | 1890 ⓘ |
| constructionStartDate | 1881 ⓘ |
| country | Wales ⓘ |
| createdBy | Liverpool Corporation Waterworks ⓘ |
| createdFor |
Liverpool water supply
ⓘ
water supply ⓘ |
| damType | stone-built gravity dam ⓘ |
| ecosystemType | upland reservoir ⓘ |
| elevationAboveSeaLevel | about 252 metres ⓘ |
| hasDesignation | RSPB reserve ⓘ |
| hasLandmark |
Vyrnwy Dam
ⓘ
surface form:
Lake Vyrnwy dam
Lake Vyrnwy sculpture trail ⓘ Lake Vyrnwy self-linksurface differs ⓘ
surface form:
Lake Vyrnwy straining tower
|
| hasNearbySettlement | Llanwddyn ⓘ |
| hasPart | Vyrnwy Dam ⓘ |
| hasStructureType | stone dam ⓘ |
| hasVegetationType |
coniferous woodland
ⓘ
heather moorland ⓘ |
| isPartOf |
Severn River system
ⓘ
surface form:
Severn river basin
|
| knownFor |
birdwatching
ⓘ
cycling routes ⓘ fishing ⓘ scenic surroundings ⓘ walking trails ⓘ wildlife ⓘ |
| length | about 7 miles ⓘ |
| locatedIn |
Berwyn Mountains
ⓘ
Powys ⓘ United Kingdom ⓘ Vyrnwy valley ⓘ
surface form:
Vyrnwy Valley
|
| managedBy |
Royal Society for the Protection of Birds
ⓘ
surface form:
RSPB
|
| notableForSpecies |
peregrine falcon
ⓘ
pipistrelle bat ⓘ red kite ⓘ |
| offersActivity |
kayaking
ⓘ
nature photography ⓘ sailing ⓘ |
| openingDate | 1892 ⓘ |
| outflow | River Vyrnwy ⓘ |
| pushpinMap | Wales ⓘ |
| submerged |
Llanwddyn
ⓘ
surface form:
old village of Llanwddyn
|
| surfaceArea | about 4.5 square kilometres ⓘ |
| tourismType | rural tourism ⓘ |
| watercourse | River Vyrnwy ⓘ |
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: Lake Vyrnwy Description of subject: Lake Vyrnwy is a large artificial reservoir in Powys, Wales, created in the 19th century to supply water to Liverpool and now known for its scenic surroundings and wildlife.
Referenced by (7)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Lake Vyrnwy Reservoir
this entity surface form:
Lake Vyrnwy straining tower
this entity surface form:
Lake Vyrnwy nature reserve