Afon Efyrnwy
E312587
Afon Efyrnwy is a river in Wales that flows through the historic county of Montgomeryshire, contributing to the River Vyrnwy within the Severn river system.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Afon Efyrnwy canonical | 4 |
How this entity was disambiguated
This entity first appeared as the object of triple T2318877 — 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: Afon Efyrnwy Context triple: [River Vyrnwy, hasLeftTributary, Afon Efyrnwy]
-
A.
Afon Wnion
Afon Wnion is a river in Gwynedd, northwest Wales, that flows through the Dolgellau area before joining the River Mawddach.
-
B.
Afon Fathew
Afon Fathew is a small river in Gwynedd, Wales, whose scenic valley is closely associated with and followed by the historic Talyllyn narrow-gauge railway.
-
C.
Afon Lliw
Afon Lliw is a river in Wales that flows through the countryside of Gwynedd before reaching Llyn Tegid (Bala Lake).
-
D.
Afon Tryweryn
Afon Tryweryn is a river in North Wales known for its white-water rapids and the controversial flooding of the village of Capel Celyn to create the Tryweryn Reservoir.
-
E.
Afon Llwyd
Afon Llwyd is a river in southeast Wales that flows through Torfaen, including the town of Cwmbran, before joining the River Usk.
- 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: Afon Efyrnwy Target entity description: Afon Efyrnwy is a river in Wales that flows through the historic county of Montgomeryshire, contributing to the River Vyrnwy within the Severn river system.
-
A.
Afon Wnion
Afon Wnion is a river in Gwynedd, northwest Wales, that flows through the Dolgellau area before joining the River Mawddach.
-
B.
Afon Fathew
Afon Fathew is a small river in Gwynedd, Wales, whose scenic valley is closely associated with and followed by the historic Talyllyn narrow-gauge railway.
-
C.
Afon Lliw
Afon Lliw is a river in Wales that flows through the countryside of Gwynedd before reaching Llyn Tegid (Bala Lake).
-
D.
Afon Tryweryn
Afon Tryweryn is a river in North Wales known for its white-water rapids and the controversial flooding of the village of Capel Celyn to create the Tryweryn Reservoir.
-
E.
Afon Llwyd
Afon Llwyd is a river in southeast Wales that flows through Torfaen, including the town of Cwmbran, before joining the River Usk.
- F. None of above. chosen
Statements (13)
| Predicate | Object |
|---|---|
| instanceOf | river ⓘ |
| country | Wales ⓘ |
| hasNameInLanguage | Welsh ⓘ |
| locatedIn |
Mid Wales
ⓘ
Montgomeryshire ⓘ Powys ⓘ historic county of Montgomeryshire ⓘ |
| mouthOf | River Vyrnwy ⓘ |
| name | Afon Efyrnwy ⓘ |
| partOf |
River Severn drainage basin
ⓘ
River Vyrnwy basin ⓘ Severn river system ⓘ
linked to:
Severn River system
|
| tributaryOf | 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: Afon Efyrnwy Description of subject: Afon Efyrnwy is a river in Wales that flows through the historic county of Montgomeryshire, contributing to the River Vyrnwy within the Severn river system.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.