River Mawddach
E58203
The River Mawddach is a scenic river in northwest Wales that flows through Snowdonia to the Mawddach Estuary near Barmouth, renowned for its natural beauty and walking and cycling trails.
All labels observed (3)
| Label | Occurrences |
|---|---|
| River Mawddach canonical | 13 |
| Afon Mawddach | 2 |
| Mawddach River | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T375272 — 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: River Mawddach Context triple: [Merionethshire, containsRiver, River Mawddach]
-
A.
River Cleddau
The River Cleddau is a river system in Pembrokeshire, Wales, whose Eastern and Western branches meet to form the Milford Haven Waterway before reaching the Irish Sea.
-
B.
River Taff
The River Taff is a major river in South Wales that flows through Merthyr Tydfil and Cardiff before reaching the Bristol Channel.
-
C.
Neath
Neath is a historic industrial and market town in South Wales, known for its Roman and medieval heritage and its role in the coal and steel industries.
-
D.
River Wye
The River Wye is a major river in Wales and western England, renowned for its scenic valley landscapes and importance as a wildlife and recreational area.
-
E.
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.
- 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: River Mawddach Target entity description: The River Mawddach is a scenic river in northwest Wales that flows through Snowdonia to the Mawddach Estuary near Barmouth, renowned for its natural beauty and walking and cycling trails.
-
A.
River Cleddau
The River Cleddau is a river system in Pembrokeshire, Wales, whose Eastern and Western branches meet to form the Milford Haven Waterway before reaching the Irish Sea.
-
B.
River Taff
The River Taff is a major river in South Wales that flows through Merthyr Tydfil and Cardiff before reaching the Bristol Channel.
-
C.
Neath
Neath is a historic industrial and market town in South Wales, known for its Roman and medieval heritage and its role in the coal and steel industries.
-
D.
River Wye
The River Wye is a major river in Wales and western England, renowned for its scenic valley landscapes and importance as a wildlife and recreational area.
-
E.
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.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
body of water
ⓘ
geographical feature ⓘ river ⓘ |
| country | Wales ⓘ |
| crosses |
Barmouth Viaduct area
ⓘ
linked to:
Barmouth
|
| drainageBasin |
Cardigan Bay basin
ⓘ
linked to:
Cardigan Bay
|
| ecosystemType |
estuarine habitat
ⓘ
upland river habitat ⓘ |
| emptiesInto | Cardigan Bay ⓘ |
| estuaryLocatedNear | Barmouth ⓘ |
| flowsInto | Mawddach Estuary ⓘ |
| flowsThrough |
Coed y Brenin Forest
ⓘ
Dolgellau ⓘ Ganllwyd ⓘ
linked to:
Llanelltyd
Snowdonia National Park ⓘ
linked to:
Snowdonia
|
| hasBridge | Barmouth Bridge ⓘ |
| hasFeature | tidal estuary ⓘ |
| hasPath |
disused railway line path
ⓘ
multi-use trail ⓘ |
| hasTributary |
Afon Eden
ⓘ
Afon Gamlan ⓘ Afon Wnion ⓘ |
| hasValley | Mawddach Valley ⓘ |
| knownFor |
Mawddach Trail
ⓘ
Mawddach Valley scenery ⓘ cycling trails ⓘ scenic beauty ⓘ walking trails ⓘ |
| languageOfName | Welsh ⓘ |
| locatedIn |
Gwynedd
ⓘ
Snowdonia ⓘ United Kingdom ⓘ northwest Wales ⓘ
linked to:
North Wales
|
| locatedOn | west coast of Wales ⓘ |
| mouth | Mawddach Estuary ⓘ |
| near |
Barmouth
ⓘ
Cadair Idris ⓘ |
| partOf | Welsh river system ⓘ |
| region | Meirionnydd ⓘ |
| sourceLocation |
Aran Fawddwy area
ⓘ
Snowdonia mountains ⓘ
linked to:
Snowdonia
|
| tourismType |
nature tourism
ⓘ
outdoor recreation ⓘ |
| usedFor |
angling
ⓘ
recreational cycling ⓘ recreational walking ⓘ |
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: River Mawddach Description of subject: The River Mawddach is a scenic river in northwest Wales that flows through Snowdonia to the Mawddach Estuary near Barmouth, renowned for its natural beauty and walking and cycling trails.
Referenced by (16)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: River Mawddach
linked to: River Mawddach
linked to: River Mawddach