Lake Chad
E113465
Lake Chad is a large, shallow, and historically significant freshwater lake in north-central Africa that has dramatically shrunk in size over recent decades due to climate change and human use.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Lake Chad canonical | 15 |
How this entity was disambiguated
This entity first appeared as the object of triple T960849 — 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: Lake Chad Context triple: [Chad, notableLake, Lake Chad]
-
A.
Lake Chad basin
The Lake Chad basin is a large, landlocked drainage region in north-central Africa encompassing parts of Chad, Nigeria, Niger, Cameroon, and surrounding countries, centered around Lake Chad and its river systems.
-
B.
Lake Turkana
Lake Turkana is a large, saline lake in Kenya’s arid north, renowned for its striking turquoise waters, rich biodiversity, and significant archaeological sites along its shores.
-
C.
Lake Bourget
Lake Bourget is a large glacial lake in eastern France, renowned for its scenic Alpine setting, biodiversity, and popularity as a destination for boating and outdoor recreation.
-
D.
Lake Albert
Lake Albert is one of Africa’s Great Lakes, lying on the border between Uganda and the Democratic Republic of the Congo within the western branch of the East African Rift.
-
E.
Lake Victoria
Lake Victoria is a vast freshwater lake in East Africa, bordered by Tanzania, Uganda, and Kenya, and is renowned as the world’s largest tropical lake and a vital regional resource.
- 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: Lake Chad Target entity description: Lake Chad is a large, shallow, and historically significant freshwater lake in north-central Africa that has dramatically shrunk in size over recent decades due to climate change and human use.
-
A.
Lake Chad basin
The Lake Chad basin is a large, landlocked drainage region in north-central Africa encompassing parts of Chad, Nigeria, Niger, Cameroon, and surrounding countries, centered around Lake Chad and its river systems.
-
B.
Lake Turkana
Lake Turkana is a large, saline lake in Kenya’s arid north, renowned for its striking turquoise waters, rich biodiversity, and significant archaeological sites along its shores.
-
C.
Lake Bourget
Lake Bourget is a large glacial lake in eastern France, renowned for its scenic Alpine setting, biodiversity, and popularity as a destination for boating and outdoor recreation.
-
D.
Lake Albert
Lake Albert is one of Africa’s Great Lakes, lying on the border between Uganda and the Democratic Republic of the Congo within the western branch of the East African Rift.
-
E.
Lake Victoria
Lake Victoria is a vast freshwater lake in East Africa, bordered by Tanzania, Uganda, and Kenya, and is renowned as the world’s largest tropical lake and a vital regional resource.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
endorheic lake
ⓘ
freshwater lake ⓘ lake ⓘ |
| area1960s | approximately 25,000 square kilometers ⓘ |
| area21stCenturyDrySeason | often less than 2,000 square kilometers ⓘ |
| averageDepth | about 1.5 meters ⓘ |
| basinCountry |
Cameroon
ⓘ
Chad ⓘ Niger ⓘ Nigeria ⓘ |
| causeOfShrinkage |
climate variability
ⓘ
human water use ⓘ increased irrigation withdrawals ⓘ reduced rainfall ⓘ |
| continent | Africa ⓘ |
| countryBorder |
Cameroon
ⓘ
Chad ⓘ Niger ⓘ Nigeria ⓘ |
| environmentalIssue |
desertification
ⓘ
ecosystem degradation ⓘ water scarcity ⓘ |
| etymology | name "Chad" derives from a local word for "lake" or "large expanse of water" ⓘ |
| governedBy | Lake Chad Basin Commission ⓘ |
| hasProperty |
historically large
ⓘ
seasonally variable ⓘ shallow ⓘ shrinking ⓘ |
| inflow |
Chari River
ⓘ
Yobe River ⓘ
surface form:
Komadougou Yobe River
Logone River ⓘ |
| isImportantFor |
agriculture
ⓘ
biodiversity ⓘ fishing ⓘ pastoralism ⓘ regional livelihoods ⓘ |
| locatedIn |
Lake Chad basin
ⓘ
surface form:
Chad Basin
Lake Chad basin ⓘ
surface form:
Lake Chad Basin
|
| locatedInRegion |
Sahel
ⓘ
north-central Africa ⓘ |
| maxDepth | about 11 meters ⓘ |
| namedAfter | Chad ⓘ |
| nearCity |
Maiduguri
ⓘ
N'Djamena ⓘ
surface form:
N’Djamena
|
| outflow | endorheic (no outflow to the sea) ⓘ |
| partOf |
Lake Chad Basin Commission
ⓘ
surface form:
Lake Chad Basin Commission area
|
| waterType | freshwater ⓘ |
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: Lake Chad Description of subject: Lake Chad is a large, shallow, and historically significant freshwater lake in north-central Africa that has dramatically shrunk in size over recent decades due to climate change and human use.
Referenced by (15)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Lake Chad Basin
subject surface form:
Lake Chad Basin
subject surface form:
Chad