IJsselmeer
E112682
IJsselmeer is a large shallow freshwater lake in the central Netherlands, created by the closure of the Zuiderzee and known for its dikes, reclaimed polders, and importance to Dutch water management and recreation.
All labels observed (7)
| Label | Occurrences |
|---|---|
| IJsselmeer canonical | 46 |
| Zuiderzee | 5 |
| IJsselmeer lake system | 2 |
| Flevo Lake | 1 |
| IJsselmeer basin | 1 |
| IJsselmeer to the east | 1 |
| Lake IJssel (IJsselmeer) | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T750655 — 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: IJsselmeer Context triple: [Friesland, borders, IJsselmeer]
-
A.
Haarlemmermeer
Haarlemmermeer is a municipality in the province of North Holland in the Netherlands, best known for encompassing Amsterdam Airport Schiphol.
-
B.
Eemsdelta
Eemsdelta is a municipality in the Dutch province of Groningen, known for its coastal location along the Ems estuary and its mix of historic villages and industrial port areas.
-
C.
IJssel
The IJssel is a major distributary branch of the Rhine River in the Netherlands, flowing northward to the IJsselmeer and playing an important role in the country’s water management and inland navigation.
-
D.
Hollandsche IJssel
Hollandsche IJssel is a river in the western Netherlands that flows through the provinces of South Holland and Utrecht and plays a role in regional water management and flood control.
-
E.
Biesbosch
Biesbosch is a large freshwater tidal wetland and national park in the Netherlands, known for its intricate network of rivers, creeks, and rich birdlife.
- 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: IJsselmeer Target entity description: IJsselmeer is a large shallow freshwater lake in the central Netherlands, created by the closure of the Zuiderzee and known for its dikes, reclaimed polders, and importance to Dutch water management and recreation.
-
A.
Haarlemmermeer
Haarlemmermeer is a municipality in the province of North Holland in the Netherlands, best known for encompassing Amsterdam Airport Schiphol.
-
B.
Eemsdelta
Eemsdelta is a municipality in the Dutch province of Groningen, known for its coastal location along the Ems estuary and its mix of historic villages and industrial port areas.
-
C.
IJssel
The IJssel is a major distributary branch of the Rhine River in the Netherlands, flowing northward to the IJsselmeer and playing an important role in the country’s water management and inland navigation.
-
D.
Hollandsche IJssel
Hollandsche IJssel is a river in the western Netherlands that flows through the provinces of South Holland and Utrecht and plays a role in regional water management and flood control.
-
E.
Biesbosch
Biesbosch is a large freshwater tidal wetland and national park in the Netherlands, known for its intricate network of rivers, creeks, and rich birdlife.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
artificial lake
ⓘ
freshwater lake ⓘ lake ⓘ |
| adjacentTo |
Ketelmeer
ⓘ
Markermeer ⓘ |
| averageDepth | about 5.5 metres ⓘ |
| basinCountry | Netherlands ⓘ |
| borderedBy |
Afsluitdijk
ⓘ
Flevopolder ⓘ Houtribdijk ⓘ Noordoostpolder ⓘ |
| country | Netherlands ⓘ |
| createdBy | construction of Afsluitdijk ⓘ |
| creationMethod | closure of Zuiderzee ⓘ |
| formedFrom |
IJsselmeer
self-linksurface differs
ⓘ
surface form:
Zuiderzee
|
| hasFeature |
bird habitats
ⓘ
dikes ⓘ reclaimed polders ⓘ shallow waters ⓘ |
| inflow |
Ketelmeer
ⓘ
Gelderse IJssel ⓘ
surface form:
River IJssel
|
| locatedIn |
central Netherlands
ⓘ
Flevoland ⓘ
surface form:
province of Flevoland
province of Friesland ⓘ province of North Holland ⓘ Overijssel ⓘ
surface form:
province of Overijssel
|
| maximumDepth | about 7 metres ⓘ |
| namedAfter |
Gelderse IJssel
ⓘ
surface form:
River IJssel
|
| outflow |
Afsluitdijk sluices
ⓘ
Houtribdijk ⓘ
surface form:
Houtribdijk sluices
Markermeer ⓘ |
| partOf |
Dutch water management system
ⓘ
Zuiderzee Works ⓘ |
| previousWaterType | saltwater ⓘ |
| separatedBy | Afsluitdijk ⓘ |
| separatedFrom | Wadden Sea ⓘ |
| significance |
important recreational area in the Netherlands
ⓘ
major component of Dutch flood protection ⓘ |
| surfaceArea | approximately 1100 square kilometres ⓘ |
| usedFor |
agricultural water supply
ⓘ
fishing ⓘ flood control ⓘ freshwater reservoir ⓘ nature conservation ⓘ recreation ⓘ sailing ⓘ water management ⓘ |
| waterType | freshwater ⓘ |
| yearCreated | 1932 ⓘ |
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: IJsselmeer Description of subject: IJsselmeer is a large shallow freshwater lake in the central Netherlands, created by the closure of the Zuiderzee and known for its dikes, reclaimed polders, and importance to Dutch water management and recreation.
Referenced by (57)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Lake IJssel (IJsselmeer)
this entity surface form:
IJsselmeer lake system
this entity surface form:
Zuiderzee
this entity surface form:
Zuiderzee
this entity surface form:
Zuiderzee
this entity surface form:
Zuiderzee
this entity surface form:
IJsselmeer basin
this entity surface form:
Zuiderzee
this entity surface form:
IJsselmeer to the east
this entity surface form:
Flevo Lake
subject surface form:
IJssel
subject surface form:
IJssel