Llyn Cowlyd
E878535
Llyn Cowlyd is a long, narrow reservoir in Snowdonia, North Wales, known for its remote, rugged setting and use in supplying water and hydroelectric power.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Llyn Cowlyd canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T10313774 — 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: Llyn Cowlyd Context triple: [Capel Curig, nearLake, Llyn Cowlyd]
-
A.
Llyn Llydaw
Llyn Llydaw is a glacial lake on the eastern flanks of Snowdon in Snowdonia National Park, Wales, renowned for its scenic mountain setting and association with local legends.
-
B.
Llyn Crafnant
Llyn Crafnant is a scenic freshwater lake in Snowdonia, North Wales, popular for walking, fishing, and views of the surrounding mountains.
-
C.
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.
-
D.
Llyn Brenig
Llyn Brenig is a large reservoir and recreational lake in North Wales, known for its scenic surroundings, walking trails, and trout fishing.
-
E.
Llyn Dinas
Llyn Dinas is a scenic natural lake in the Snowdonia region of North Wales, popular for walking, photography, and its surrounding mountainous landscapes.
- 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: Llyn Cowlyd Target entity description: Llyn Cowlyd is a long, narrow reservoir in Snowdonia, North Wales, known for its remote, rugged setting and use in supplying water and hydroelectric power.
-
A.
Llyn Llydaw
Llyn Llydaw is a glacial lake on the eastern flanks of Snowdon in Snowdonia National Park, Wales, renowned for its scenic mountain setting and association with local legends.
-
B.
Llyn Crafnant
Llyn Crafnant is a scenic freshwater lake in Snowdonia, North Wales, popular for walking, fishing, and views of the surrounding mountains.
-
C.
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.
-
D.
Llyn Brenig
Llyn Brenig is a large reservoir and recreational lake in North Wales, known for its scenic surroundings, walking trails, and trout fishing.
-
E.
Llyn Dinas
Llyn Dinas is a scenic natural lake in the Snowdonia region of North Wales, popular for walking, photography, and its surrounding mountainous landscapes.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
lake
ⓘ
reservoir ⓘ |
| access |
mountain track from Trefriw
ⓘ
track from Dolgarrog ⓘ |
| basinCountry | United Kingdom ⓘ |
| catchmentArea |
Carneddau mountains
ⓘ
linked to:
Carneddau
|
| connectedBy | water conduits to Dolgarrog power station ⓘ |
| country | Wales ⓘ |
| damType | concrete gravity dam ⓘ |
| elevationAboveSeaLevel | approximately 357 metres ⓘ |
| hasHydroelectricConnection | Dolgarrog hydroelectric power scheme ⓘ |
| hasIsland | no permanent islands ⓘ |
| hasNearbyPeak |
Carnedd Llewelyn
ⓘ
linked to:
Carnedd Llywelyn
Creigiau Gleision ⓘ Pen Llithrig y Wrach ⓘ |
| hasStructure | Llyn Cowlyd dam ⓘ |
| languageOfName | Welsh ⓘ |
| length | approximately 3.5 kilometres ⓘ |
| locatedIn |
Conwy County Borough
ⓘ
North Wales ⓘ Snowdonia ⓘ |
| locatedInValley | Cwm Cowlyd ⓘ |
| locatedOn | eastern flank of the Carneddau ⓘ |
| managedBy | Dŵr Cymru Welsh Water ⓘ |
| maximumDepth | approximately 70 metres ⓘ |
| near |
Dolgarrog
ⓘ
Trefriw ⓘ |
| notableFor |
bleak upland scenery
ⓘ
relative isolation from roads ⓘ |
| orientation | southwest–northeast ⓘ |
| outflow | Afon Ddu ⓘ |
| partOf |
Snowdonia National Park
ⓘ
linked to:
Snowdonia
|
| primaryUse |
hydroelectric power generation
ⓘ
public water supply ⓘ |
| region | Gwynedd and Conwy region of Wales ⓘ |
| setting |
remote
ⓘ
rugged ⓘ |
| shape | long and narrow ⓘ |
| suppliesWaterTo |
Conwy Valley
ⓘ
Llandudno area ⓘ town of Conwy ⓘ |
| surroundedBy | steep mountain slopes ⓘ |
| usedFor |
angling
ⓘ
recreational walking ⓘ |
| waterManagementRole | strategic reservoir for North Wales water supply network ⓘ |
| waterType | freshwater ⓘ |
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: Llyn Cowlyd Description of subject: Llyn Cowlyd is a long, narrow reservoir in Snowdonia, North Wales, known for its remote, rugged setting and use in supplying water and hydroelectric power.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.