Nebraska–South Dakota border
E119482
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.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Nebraska–South Dakota border canonical | 3 |
| South Dakota–Iowa border | 1 |
| South Dakota–Nebraska border | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T989680 — 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: Nebraska–South Dakota border Context triple: [Missouri River, USStateBorderFor, Nebraska–South Dakota border]
-
A.
Nebraska–Iowa border
The Nebraska–Iowa border is the state line in the central United States that largely follows the course of the Missouri River, separating Nebraska to the west from Iowa to the east.
-
B.
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.
-
C.
Nebraska–Missouri border
The Nebraska–Missouri border is the state line in the central United States that largely follows the course of the Missouri River, separating Nebraska to the west from Missouri to the east.
-
D.
Missouri–Kansas state line
The Missouri–Kansas state line is the boundary separating the states of Missouri and Kansas, notably running through the Kansas City metropolitan area and dividing it between the two states.
-
E.
Nevada–Utah state line
The Nevada–Utah state line is the boundary separating the U.S. states of Nevada and Utah, running through remote desert landscapes and near notable features such as the Bonneville Salt Flats.
- 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: Nebraska–South Dakota border Target entity description: 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.
-
A.
Nebraska–Iowa border
The Nebraska–Iowa border is the state line in the central United States that largely follows the course of the Missouri River, separating Nebraska to the west from Iowa to the east.
-
B.
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.
-
C.
Nebraska–Missouri border
The Nebraska–Missouri border is the state line in the central United States that largely follows the course of the Missouri River, separating Nebraska to the west from Missouri to the east.
-
D.
Missouri–Kansas state line
The Missouri–Kansas state line is the boundary separating the states of Missouri and Kansas, notably running through the Kansas City metropolitan area and dividing it between the two states.
-
E.
Nevada–Utah state line
The Nevada–Utah state line is the boundary separating the U.S. states of Nevada and Utah, running through remote desert landscapes and near notable features such as the Bonneville Salt Flats.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
U.S. state border
ⓘ
international-free subnational boundary ⓘ |
| adjacentTo |
Nebraska–Wyoming border
ⓘ
surface form:
Nebraska–Colorado border
Nebraska–Iowa border ⓘ Nebraska–Wyoming border ⓘ Iowa–South Dakota border ⓘ
surface form:
South Dakota–Iowa border
South Dakota–North Dakota border ⓘ South Dakota–Wyoming border ⓘ |
| continent | North America ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| crossedBy |
Interstate 129
NERFINISHED
ⓘ
U.S. Route 281 ⓘ U.S. Route 385 NERFINISHED ⓘ U.S. Route 81 NERFINISHED ⓘ U.S. Route 81 Missouri River bridge near Yankton ⓘ various local bridges over the Missouri River ⓘ |
| direction | east–west ⓘ |
| establishedFor |
creation of the State of Nebraska
ⓘ
creation of the State of South Dakota ⓘ |
| follows | Missouri River ⓘ |
| formsBoundaryOf |
Nebraska
ⓘ
South Dakota ⓘ |
| hasAdjacentSettlement |
Niobrara, Nebraska
ⓘ
Sioux City metropolitan area ⓘ Yankton, South Dakota, United States ⓘ
surface form:
Yankton, South Dakota
|
| hasHistoricalBasis | Missouri River course at time of state admission ⓘ |
| hasJurisdictionOnSide |
Nebraska
ⓘ
surface form:
State of Nebraska
South Dakota ⓘ
surface form:
State of South Dakota
|
| hasNaturalFeature |
Missouri River floodplain
ⓘ
river islands of the Missouri River ⓘ |
| hasPart | Missouri River ⓘ |
| legalStatus | state boundary defined by U.S. federal and state law ⓘ |
| locatedInTheAdministrativeTerritorialEntity |
Nebraska
ⓘ
South Dakota ⓘ |
| locatedInTimeZone |
Central Time Zone
ⓘ
Mountain Time Zone ⓘ |
| partOf |
borders of Nebraska
ⓘ
borders of South Dakota ⓘ borders of the United States ⓘ |
| riverBoundaryFor |
Nebraska
ⓘ
South Dakota ⓘ |
| separates |
Nebraska
ⓘ
South Dakota ⓘ |
| usedFor |
administrative division
ⓘ
jurisdictional delimitation ⓘ statistical demarcation ⓘ |
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: Nebraska–South Dakota border Description of subject: 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.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
South Dakota–Iowa border
this entity surface form:
South Dakota–Nebraska border