Pennsylvania–Delaware border
E682505
The Pennsylvania–Delaware border is the state line separating Pennsylvania and Delaware, historically notable for its role in colonial boundary disputes and its distinctive arc-shaped segment centered on New Castle.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Delaware state border | 1 |
| Delaware–Pennsylvania state line | 1 |
| Pennsylvania–Delaware border canonical | 1 |
| Pennsylvania–Delaware state line | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7712905 — 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: Pennsylvania–Delaware border Context triple: [Chadds Ford, Pennsylvania, locatedNear, Pennsylvania–Delaware border]
-
A.
Pennsylvania–New York border
The Pennsylvania–New York border is the interstate boundary separating the U.S. states of Pennsylvania and New York, running largely east–west across the northern edge of Pennsylvania.
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B.
Pennsylvania border
The Pennsylvania border is the state boundary line separating Pennsylvania from its neighboring states, including West Virginia near Wheeling.
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C.
Maryland state line
The Maryland state line is the boundary separating the state of Maryland from its neighboring states, including Pennsylvania’s Bedford County.
-
D.
District of Columbia–Maryland border
The District of Columbia–Maryland border is the boundary line separating Washington, D.C. from the state of Maryland, running through both urban and natural areas in the region.
-
E.
Virginia–West Virginia boundary
The Virginia–West Virginia boundary is the state line that separates Virginia from its northwestern neighbor West Virginia, following a historically contested course through the Appalachian region.
- 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: Pennsylvania–Delaware border Target entity description: The Pennsylvania–Delaware border is the state line separating Pennsylvania and Delaware, historically notable for its role in colonial boundary disputes and its distinctive arc-shaped segment centered on New Castle.
-
A.
Pennsylvania–New York border
The Pennsylvania–New York border is the interstate boundary separating the U.S. states of Pennsylvania and New York, running largely east–west across the northern edge of Pennsylvania.
-
B.
Pennsylvania border
The Pennsylvania border is the state boundary line separating Pennsylvania from its neighboring states, including West Virginia near Wheeling.
-
C.
Maryland state line
The Maryland state line is the boundary separating the state of Maryland from its neighboring states, including Pennsylvania’s Bedford County.
-
D.
District of Columbia–Maryland border
The District of Columbia–Maryland border is the boundary line separating Washington, D.C. from the state of Maryland, running through both urban and natural areas in the region.
-
E.
Virginia–West Virginia boundary
The Virginia–West Virginia boundary is the state line that separates Virginia from its northwestern neighbor West Virginia, following a historically contested course through the Appalachian region.
- F. None of above. chosen
Statements (42)
| Predicate | Object |
|---|---|
| instanceOf |
interstate border
ⓘ
state boundary ⓘ |
| adjacentTo |
Chester County, Pennsylvania
NERFINISHED
ⓘ
Delaware County, Pennsylvania NERFINISHED ⓘ New Castle County, Delaware NERFINISHED ⓘ |
| approximateArcRadius | 12 miles ⓘ |
| cartographicallyDistinct | yes ⓘ |
| centerOfArc | New Castle, Delaware NERFINISHED ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| definedBy |
Twelve-mile radius from New Castle courthouse
ⓘ
colonial charters of Pennsylvania and Delaware ⓘ |
| governingAuthorityAtCreation | British Crown NERFINISHED ⓘ |
| hasCoordinateSystemBasis | surveys conducted in the 18th century ⓘ |
| hasDisputeType | colonial-era territorial dispute ⓘ |
| hasLanguage | English (legal descriptions) ⓘ |
| hasLegalPrecedent | U.S. Supreme Court decisions on Delaware–New Jersey and related boundaries NERFINISHED ⓘ |
| hasNotableFeature | Twelve-Mile Circle NERFINISHED ⓘ |
| hasSegment |
arc boundary along the Twelve-Mile Circle
ⓘ
straight-line boundary segments north of the arc ⓘ |
| historicalRole |
dispute between William Penn and Lord Baltimore land claims
ⓘ
site of colonial boundary disputes ⓘ |
| influencedBy |
English colonial grants
ⓘ
royal charters in the 17th and 18th centuries ⓘ |
| jurisdictionBoundaryFor |
Commonwealth of Pennsylvania
NERFINISHED
ⓘ
State of Delaware NERFINISHED ⓘ |
| legalStatus | recognized state boundary in U.S. law ⓘ |
| mapFeatureType | political boundary ⓘ |
| notableFor |
one of the few circular state boundaries in the United States
ⓘ
use of a geometric arc rather than only straight lines ⓘ |
| partOf |
border of Delaware
ⓘ
border of Pennsylvania ⓘ |
| passesNear | Delaware River NERFINISHED ⓘ |
| relatedEvent | Mason–Dixon survey NERFINISHED ⓘ |
| relatedTo | Mason–Dixon line NERFINISHED ⓘ |
| resolvedBy | agreements following Mason–Dixon survey ⓘ |
| separates |
Delaware
NERFINISHED
ⓘ
Pennsylvania NERFINISHED ⓘ |
| shapeFeature | arc-shaped segment centered on New Castle, Delaware ⓘ |
| timePeriodOfFormation | 17th–18th centuries ⓘ |
| usedFor |
electoral district delimitation
ⓘ
law enforcement jurisdiction delimitation ⓘ taxation jurisdiction delimitation ⓘ |
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: Pennsylvania–Delaware border Description of subject: The Pennsylvania–Delaware border is the state line separating Pennsylvania and Delaware, historically notable for its role in colonial boundary disputes and its distinctive arc-shaped segment centered on New Castle.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Pennsylvania–Delaware state line
this entity surface form:
Delaware state border
Ebright Azimuth vicinity (Delaware high point region)
→
locatedNear
→
Pennsylvania–Delaware border
ⓘ
subject surface form:
Ebright Azimuth vicinity
this entity surface form:
Delaware–Pennsylvania state line