Ogallala Aquifer
E50494
The Ogallala Aquifer is one of the world’s largest underground freshwater reservoirs, supplying crucial irrigation and drinking water across much of the central United States.
All labels observed (8)
How this entity was disambiguated
This entity first appeared as the object of triple T396870 — 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: Ogallala Aquifer Context triple: [Great Plains, contains, Ogallala Aquifer]
-
A.
Murray Irrigation Area
The Murray Irrigation Area is a major agricultural irrigation district in the Riverina region of New South Wales, Australia, known for its extensive network of channels supplying water to broadacre farms.
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B.
Mono Basin
Mono Basin is a high-desert watershed in eastern California best known for Mono Lake, its striking tufa formations, and its dramatic Eastern Sierra scenery.
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C.
Tulare Basin
Tulare Basin is a large, endorheic subregion in the southern part of California’s Central Valley, historically dominated by extensive wetlands and Tulare Lake.
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D.
Great Basin
The Great Basin is a vast, arid region of interior drainage in the western United States, characterized by its basin-and-range topography, deserts, and salt flats.
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E.
Amargosa River basin
The Amargosa River basin is an arid watershed in the Mojave Desert known for its intermittent river, unique desert ecosystems, and rare oases supporting specialized 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: Ogallala Aquifer Target entity description: The Ogallala Aquifer is one of the world’s largest underground freshwater reservoirs, supplying crucial irrigation and drinking water across much of the central United States.
-
A.
Murray Irrigation Area
The Murray Irrigation Area is a major agricultural irrigation district in the Riverina region of New South Wales, Australia, known for its extensive network of channels supplying water to broadacre farms.
-
B.
Mono Basin
Mono Basin is a high-desert watershed in eastern California best known for Mono Lake, its striking tufa formations, and its dramatic Eastern Sierra scenery.
-
C.
Tulare Basin
Tulare Basin is a large, endorheic subregion in the southern part of California’s Central Valley, historically dominated by extensive wetlands and Tulare Lake.
-
D.
Great Basin
The Great Basin is a vast, arid region of interior drainage in the western United States, characterized by its basin-and-range topography, deserts, and salt flats.
-
E.
Amargosa River basin
The Amargosa River basin is an arid watershed in the Mojave Desert known for its intermittent river, unique desert ecosystems, and rare oases supporting specialized wildlife.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
aquifer
ⓘ
groundwater reservoir ⓘ natural resource ⓘ |
| composition |
clay
ⓘ
gravel ⓘ sand ⓘ silt ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| extendsUnder |
Colorado
ⓘ
Kansas ⓘ Nebraska ⓘ New Mexico ⓘ Oklahoma ⓘ South Dakota ⓘ Texas ⓘ Wyoming ⓘ |
| geologicAge | Tertiary ⓘ |
| importance |
critical to U.S. agricultural output
ⓘ
one of the world’s largest freshwater aquifers ⓘ |
| issue |
declining water levels
ⓘ
groundwater depletion ⓘ overpumping for irrigation ⓘ sustainability concerns ⓘ |
| locatedIn |
Great Plains
ⓘ
High Plains ⓘ
linked to:
Great Plains
|
| majorCropsIrrigated |
corn
ⓘ
cotton ⓘ sorghum ⓘ wheat ⓘ |
| managementConcern |
groundwater management policy
ⓘ
water conservation ⓘ |
| namedAfter | Ogallala, Nebraska ⓘ |
| partOf |
High Plains Aquifer system
ⓘ
linked to:
Ogallala Aquifer
|
| primaryFormation |
Ogallala Formation
ⓘ
linked to:
Ogallala Aquifer
|
| rechargeRate | slow ⓘ |
| rechargeSource |
precipitation
ⓘ
surface water infiltration ⓘ |
| regionType | semi-arid ⓘ |
| studiedBy | United States Geological Survey ⓘ |
| supports |
agricultural production
ⓘ
industrial water use ⓘ major crop irrigation ⓘ municipal water supply ⓘ rural communities ⓘ |
| threat |
climate variability
ⓘ
drought ⓘ |
| use |
drinking water supply
ⓘ
irrigation ⓘ livestock watering ⓘ |
| 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: Ogallala Aquifer Description of subject: The Ogallala Aquifer is one of the world’s largest underground freshwater reservoirs, supplying crucial irrigation and drinking water across much of the central United States.
Referenced by (18)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Ogallala Aquifer
linked to: Ogallala Aquifer
subject linked to:
eastern Colorado
linked to: Ogallala Aquifer
linked to: Ogallala Aquifer
linked to: Ogallala Aquifer
subject linked to:
western Kansas
linked to: Ogallala Aquifer
linked to: Ogallala Aquifer
linked to: Ogallala Aquifer