Llyn Brianne dam
E633528
Llyn Brianne dam is a large concrete gravity dam in mid-Wales that creates the Llyn Brianne reservoir, a major source of water supply and flood control in the River Tywi valley.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Llyn Brianne | 2 |
| Llyn Brianne dam canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6977914 — 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 Brianne dam Context triple: [River Tywi, hasStructureOn, Llyn Brianne dam]
-
A.
Llyn Brenig
Llyn Brenig is a large reservoir and recreational lake in North Wales, known for its scenic surroundings, walking trails, and trout fishing.
-
B.
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.
-
C.
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.
-
D.
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.
-
E.
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.
- 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 Brianne dam Target entity description: Llyn Brianne dam is a large concrete gravity dam in mid-Wales that creates the Llyn Brianne reservoir, a major source of water supply and flood control in the River Tywi valley.
-
A.
Llyn Brenig
Llyn Brenig is a large reservoir and recreational lake in North Wales, known for its scenic surroundings, walking trails, and trout fishing.
-
B.
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.
-
C.
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.
-
D.
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.
-
E.
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.
- F. None of above. chosen
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
concrete gravity dam
ⓘ
dam ⓘ |
| basinCountry | United Kingdom ⓘ |
| country | Wales ⓘ |
| createsReservoir |
Llyn Brianne reservoir
ⓘ
linked to:
Llyn Brianne Reservoir
|
| damType | gravity dam ⓘ |
| forms |
Llyn Brianne
ⓘ
linked to:
Llyn Brianne dam
|
| hasFunction |
flood mitigation
ⓘ
public water supply ⓘ regulation of river flow ⓘ |
| hasSpillway | yes ⓘ |
| impounds | River Tywi ⓘ |
| isMajorInfrastructureFor |
south-west Wales
ⓘ
linked to:
West Wales
|
| locatedIn |
Carmarthenshire
ⓘ
mid-Wales ⓘ |
| locatedInNationalContext | Wales water supply system ⓘ |
| locatedNear | Cambrian Mountains ⓘ |
| locatedOnRiver | River Tywi ⓘ |
| managesWaterFor | River Tywi valley ⓘ |
| material | concrete ⓘ |
| operator | Dŵr Cymru Welsh Water ⓘ |
| owner | Dŵr Cymru Welsh Water ⓘ |
| partOf | River Tywi catchment ⓘ |
| purpose |
flood control
ⓘ
water supply ⓘ |
| region |
Tywi valley
ⓘ
linked to:
Tywi Valley
|
| reservoirName |
Llyn Brianne
ⓘ
linked to:
Llyn Brianne dam
|
| usedFor |
downstream flood protection
ⓘ
potable water supply ⓘ river flow augmentation ⓘ |
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 Brianne dam Description of subject: Llyn Brianne dam is a large concrete gravity dam in mid-Wales that creates the Llyn Brianne reservoir, a major source of water supply and flood control in the River Tywi valley.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Llyn Brianne dam
linked to: Llyn Brianne dam