South Dakota–North Dakota border
E514775
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.
All labels observed (2)
| Label | Occurrences |
|---|---|
| North Dakota–South Dakota border | 4 |
| 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
ⓘ
linked to:
United States of America
|
| definedBy | United States Congress ⓘ |
| 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
ⓘ
linked to:
North Dakota
|
| governingJurisdictionSouth |
State of South Dakota
ⓘ
linked to:
South Dakota
|
| hasAdjacentStateToNorth | North Dakota ⓘ |
| hasAdjacentStateToSouth | South Dakota ⓘ |
| 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
ⓘ
Missouri River ⓘ Standing Rock Indian Reservation ⓘ |
| passesThroughRegion | Great Plains ⓘ |
| separates |
North Dakota
ⓘ
South Dakota ⓘ |
| shape | straight line ⓘ |
| usedFor | state 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: South Dakota–North Dakota border Description of subject: 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.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: South Dakota–North Dakota border
linked to: South Dakota–North Dakota border
linked to: South Dakota–North Dakota border
linked to: South Dakota–North Dakota border