Occoquan Reservoir
E580593
Occoquan Reservoir is a man-made lake in Northern Virginia that serves as a major drinking water source and recreational area for the Washington, D.C. metropolitan region.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Occoquan Reservoir canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T6257905 — 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: Occoquan Reservoir Context triple: [Occoquan River, hasReservoir, Occoquan Reservoir]
-
A.
Lexington Reservoir
Lexington Reservoir is a man-made lake and popular recreation area in Santa Clara County, California, used for water supply, fishing, and outdoor activities.
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B.
Titicus Reservoir
Titicus Reservoir is a man-made lake in Westchester County, New York, that serves as one of the key water supply reservoirs for New York City.
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C.
Boonton Reservoir
Boonton Reservoir is a man-made lake in northern New Jersey that serves as a major water supply source and recreational area for the surrounding region.
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D.
Malden Reservoir
Malden Reservoir is a man-made water body in Massachusetts that serves as a local water supply and recreational resource within the greater Boston area.
-
E.
Buckley Dunton Reservoir
Buckley Dunton Reservoir is a scenic man-made lake in Becket, Massachusetts, popular for fishing, paddling, and wildlife viewing within the Berkshires.
- 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: Occoquan Reservoir Target entity description: Occoquan Reservoir is a man-made lake in Northern Virginia that serves as a major drinking water source and recreational area for the Washington, D.C. metropolitan region.
-
A.
Lexington Reservoir
Lexington Reservoir is a man-made lake and popular recreation area in Santa Clara County, California, used for water supply, fishing, and outdoor activities.
-
B.
Titicus Reservoir
Titicus Reservoir is a man-made lake in Westchester County, New York, that serves as one of the key water supply reservoirs for New York City.
-
C.
Boonton Reservoir
Boonton Reservoir is a man-made lake in northern New Jersey that serves as a major water supply source and recreational area for the surrounding region.
-
D.
Malden Reservoir
Malden Reservoir is a man-made water body in Massachusetts that serves as a local water supply and recreational resource within the greater Boston area.
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E.
Buckley Dunton Reservoir
Buckley Dunton Reservoir is a scenic man-made lake in Becket, Massachusetts, popular for fishing, paddling, and wildlife viewing within the Berkshires.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
drinking water reservoir
ⓘ
reservoir ⓘ |
| basinCountry |
United States of America
ⓘ
surface form:
United States
|
| country |
United States of America
ⓘ
surface form:
United States
|
| createdBy |
construction of a dam near Occoquan, Virginia
ⓘ
impoundment of the Occoquan River ⓘ |
| formedBy | Occoquan River NERFINISHED ⓘ |
| hasInflow | Occoquan River NERFINISHED ⓘ |
| hasOutflow | Occoquan River NERFINISHED ⓘ |
| hasShorelineUse |
parkland
ⓘ
residential development ⓘ |
| length |
approximately 17 miles
ⓘ
approximately 27 kilometers ⓘ |
| locatedIn |
Fairfax County, Virginia
ⓘ
Northern Virginia ⓘ Prince William County, Virginia NERFINISHED ⓘ Virginia ⓘ Washington metropolitan area ⓘ
surface form:
Washington, D.C. metropolitan area
|
| locatedNear |
City of Woodbridge, Virginia
NERFINISHED
ⓘ
Town of Occoquan, Virginia NERFINISHED ⓘ |
| managedBy | Fairfax Water NERFINISHED ⓘ |
| nearbyProtectedArea |
Fountainhead Regional Park
NERFINISHED
ⓘ
Occoquan Bay National Wildlife Refuge NERFINISHED ⓘ Occoquan Regional Park NERFINISHED ⓘ |
| operator | Fairfax Water NERFINISHED ⓘ |
| partOf |
Occoquan Watershed
NERFINISHED
ⓘ
Potomac River watershed NERFINISHED ⓘ |
| primaryFunction | major drinking water source for the Washington, D.C. metropolitan region ⓘ |
| prohibitedActivity | swimming ⓘ |
| recreationalActivity |
boating
ⓘ
canoeing ⓘ fishing ⓘ kayaking ⓘ rowing ⓘ |
| region |
Mid-Atlantic states
ⓘ
surface form:
Mid-Atlantic United States
|
| suppliesWaterTo |
Fairfax County, Virginia
NERFINISHED
ⓘ
Prince William County, Virginia NERFINISHED ⓘ parts of the Washington, D.C. metropolitan area ⓘ |
| surfaceArea |
approximately 2,100 acres
ⓘ
approximately 8.5 square kilometers ⓘ |
| use |
drinking water supply
ⓘ
flood control ⓘ recreation ⓘ |
| watercourse | Occoquan River NERFINISHED ⓘ |
| waterQualityConcern |
algal blooms
ⓘ
nutrient pollution ⓘ |
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: Occoquan Reservoir Description of subject: Occoquan Reservoir is a man-made lake in Northern Virginia that serves as a major drinking water source and recreational area for the Washington, D.C. metropolitan region.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.