Pennsylvania–Maryland border

E1239802 UNEXPLORED

The Pennsylvania–Maryland border is a historically significant state line in the eastern United States, largely following the Mason–Dixon Line and separating Pennsylvania to the north from Maryland to the south.

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All labels observed (7)

Label	Occurrences
Maryland–Pennsylvania border	2
Maryland–Pennsylvania boundary	1
Maryland–Pennsylvania frontier	1
Maryland–Pennsylvania state line near Green Spring	1
Pennsylvania state line	1
Pennsylvania–Maryland border canonical	1
Pennsylvania–Maryland state line	1

How this entity was disambiguated

This entity first appeared as the object of triple T16911899 — 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–Maryland border
Context triple: [Salisbury, Pennsylvania, locatedNear, Pennsylvania–Maryland border]

A. Pennsylvania–Delaware border
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.
B. Pennsylvania–New Jersey state line
The Pennsylvania–New Jersey state line is the interstate boundary separating Pennsylvania and New Jersey, largely following the course of the Delaware River and crossed by numerous roads and rail lines.
C. 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.
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. New Jersey–Delaware border
The New Jersey–Delaware border is the state boundary running along the lower Delaware River and Bay, separating New Jersey from Delaware and intersected by major crossings such as the Delaware Memorial Bridge.
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–Maryland border
Target entity description: The Pennsylvania–Maryland border is a historically significant state line in the eastern United States, largely following the Mason–Dixon Line and separating Pennsylvania to the north from Maryland to the south.

A. Pennsylvania–Delaware border
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.
B. Pennsylvania–New Jersey state line
The Pennsylvania–New Jersey state line is the interstate boundary separating Pennsylvania and New Jersey, largely following the course of the Delaware River and crossed by numerous roads and rail lines.
C. 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.
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. New Jersey–Delaware border
The New Jersey–Delaware border is the state boundary running along the lower Delaware River and Bay, separating New Jersey from Delaware and intersected by major crossings such as the Delaware Memorial Bridge.
F. None of above. chosen