South Dakota–North Dakota border

E514775

international-free internal border state border of the United States

The South Dakota–North Dakota border is the straight east–west state line separating South Dakota and North Dakota in the north-central United States.

Try in SPARQL Jump to: Surface forms Disambiguation Statements Elicitation Referenced by

All labels observed (2)

Label	Occurrences
North Dakota–South Dakota border	2
South Dakota–North Dakota border canonical	1

How this entity was disambiguated

This entity first appeared as the object of triple T5280474 — 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: South Dakota–North Dakota border
Context triple: [Nebraska–South Dakota border, adjacentTo, South Dakota–North Dakota border]

A. Minnesota–South Dakota border
The Minnesota–South Dakota border is the state line in the north-central United States separating Minnesota and South Dakota, much of which follows natural features such as rivers and survey lines across the prairie.
B. Nebraska–South Dakota border
The Nebraska–South Dakota border is a U.S. state boundary running largely along the Missouri River, separating Nebraska to the south from South Dakota to the north.
C. South Dakota–Wyoming border
The South Dakota–Wyoming border is the state line in the north-central United States separating South Dakota from Wyoming, running near landmarks such as the Black Hills region.
D. Iowa–South Dakota border
The Iowa–South Dakota border is the state line in the north-central United States that largely follows the course of the Big Sioux River, separating Iowa from South Dakota.
E. Nebraska–Wyoming border
The Nebraska–Wyoming border is the state line in the western Great Plains where Nebraska meets Wyoming, running largely north–south and helping define the political and geographic boundary between the two states.
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: South Dakota–North Dakota border
Target entity description: The South Dakota–North Dakota border is the straight east–west state line separating South Dakota and North Dakota in the north-central United States.

A. Minnesota–South Dakota border
The Minnesota–South Dakota border is the state line in the north-central United States separating Minnesota and South Dakota, much of which follows natural features such as rivers and survey lines across the prairie.
B. Nebraska–South Dakota border
The Nebraska–South Dakota border is a U.S. state boundary running largely along the Missouri River, separating Nebraska to the south from South Dakota to the north.
C. South Dakota–Wyoming border
The South Dakota–Wyoming border is the state line in the north-central United States separating South Dakota from Wyoming, running near landmarks such as the Black Hills region.
D. Iowa–South Dakota border
The Iowa–South Dakota border is the state line in the north-central United States that largely follows the course of the Big Sioux River, separating Iowa from South Dakota.
E. Nebraska–Wyoming border
The Nebraska–Wyoming border is the state line in the western Great Plains where Nebraska meets Wyoming, running largely north–south and helping define the political and geographic boundary between the two states.
F. None of above. chosen

Statements (30)

Predicate	Object
instanceOf	international-free internal border ⓘ state border of the United States ⓘ
coordinateSystem	latitude 45 degrees north ⓘ
country	United States of America ⓘ surface form: United States
definedBy	United States Congress NERFINISHED ⓘ
establishedBy	admission of North Dakota to the Union ⓘ admission of South Dakota to the Union ⓘ
establishedInYear	1889 ⓘ
formsPartOf	northern boundary of South Dakota ⓘ southern boundary of North Dakota ⓘ
governingJurisdictionNorth	State of North Dakota NERFINISHED ⓘ
governingJurisdictionSouth	State of South Dakota NERFINISHED ⓘ
hasAdjacentStateToNorth	North Dakota NERFINISHED ⓘ
hasAdjacentStateToSouth	South Dakota NERFINISHED ⓘ
hasBorderType	land border ⓘ river-crossing segments ⓘ
hasLegalStatus	interstate boundary ⓘ
legalDefinition	parallel of forty-five degrees north latitude ⓘ
locatedInRegion	north-central United States ⓘ
orientation	east–west ⓘ
partOf	45th parallel north borders in the United States ⓘ boundary between Midwestern states ⓘ
passesNear	Lake Oahe NERFINISHED ⓘ Missouri River NERFINISHED ⓘ Standing Rock Indian Reservation NERFINISHED ⓘ
passesThroughRegion	Great Plains NERFINISHED ⓘ
separates	North Dakota NERFINISHED ⓘ South Dakota NERFINISHED ⓘ
shape	straight line ⓘ
usedFor	state jurisdiction delimitation ⓘ

How these facts were elicited

Referenced by (3)

Full triples — surface form annotated when it differs from this entity's canonical label.

Nebraska–South Dakota border → adjacentTo → South Dakota–North Dakota border ⓘ

Lake Oahe → crosses → South Dakota–North Dakota border ⓘ

this entity surface form: North Dakota–South Dakota border

Dickey County, North Dakota → borderFeature → South Dakota–North Dakota border ⓘ