Llyn Ystradau
E895548
Llyn Ystradau is a reservoir in North Wales, situated near the former slate-mining town of Blaenau Ffestiniog in the Snowdonia region.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Llyn Ystradau canonical | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T10944387 — 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 Ystradau Context triple: [Blaenau Ffestiniog, hasNearbyReservoir, Llyn Ystradau]
-
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 Tegid
Llyn Tegid, also known as Bala Lake, is the largest natural lake in Wales, renowned for its scenic beauty and unique aquatic wildlife.
-
C.
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.
-
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 Gwynant
Llyn Gwynant is a scenic lake in the Snowdonia region of North Wales, popular for its surrounding mountain views and outdoor activities such as hiking, kayaking, and camping.
- 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 Ystradau Target entity description: Llyn Ystradau is a reservoir in North Wales, situated near the former slate-mining town of Blaenau Ffestiniog in the Snowdonia region.
-
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 Tegid
Llyn Tegid, also known as Bala Lake, is the largest natural lake in Wales, renowned for its scenic beauty and unique aquatic wildlife.
-
C.
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.
-
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 Gwynant
Llyn Gwynant is a scenic lake in the Snowdonia region of North Wales, popular for its surrounding mountain views and outdoor activities such as hiking, kayaking, and camping.
- F. None of above. chosen
Statements (24)
| Predicate | Object |
|---|---|
| instanceOf | reservoir ⓘ |
| basinCountry |
United Kingdom
ⓘ
Wales ⓘ |
| country | Wales ⓘ |
| hasEnvironment |
mountainous area
ⓘ
slate quarrying landscape ⓘ |
| hasLanguageRegion | Welsh-speaking area ⓘ |
| hasNameLanguage | Welsh ⓘ |
| locatedIn |
Gwynedd
ⓘ
North Wales ⓘ Snowdonia ⓘ United Kingdom ⓘ historic county of Merionethshire ⓘ northwest Wales ⓘ
linked to:
north-west Wales
|
| locatedNear | Blaenau Ffestiniog ⓘ |
| nearbyIndustry | slate mining ⓘ |
| nearbyProtectedArea |
Snowdonia National Park
ⓘ
linked to:
Eryri National Park
|
| nearbySettlement | Blaenau Ffestiniog ⓘ |
| nearbyTownType | former slate-mining town ⓘ |
| partOf |
Ffestiniog pumped-storage scheme
ⓘ
linked to:
Dinorwig Power Station
|
| region |
Snowdonia National Park
ⓘ
linked to:
Eryri National Park
|
| usedFor |
hydroelectric power
ⓘ
water storage ⓘ |
| waterBodyType | artificial 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: Llyn Ystradau Description of subject: Llyn Ystradau is a reservoir in North Wales, situated near the former slate-mining town of Blaenau Ffestiniog in the Snowdonia region.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.