Iowa–South Dakota border
E91942
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.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Iowa–South Dakota border canonical | 4 |
| South Dakota–Iowa border | 4 |
| Iowa–South Dakota state line | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T776990 — 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: Iowa–South Dakota border Context triple: [Hawarden, Iowa, borderFeature, Iowa–South Dakota border]
-
A.
Siouxland region
The Siouxland region is a tri-state area in the upper Midwest of the United States, centered around Sioux City and encompassing parts of Iowa, Nebraska, and South Dakota.
-
B.
Iowa
Iowa is a Midwestern U.S. state known for its extensive agriculture, especially corn and soybean production, and its role in national politics through the Iowa caucuses.
-
C.
Nebraska–Iowa region
The Nebraska–Iowa region is a bi-state area in the central United States that encompasses communities and economic activity spanning the border between eastern Nebraska and western Iowa, including the Omaha–Council Bluffs metropolitan area.
-
D.
Yankton, South Dakota, United States
Yankton is a small city in southeastern South Dakota known as a historic Missouri River port and the birthplace of NFL kicker Adam Vinatieri.
-
E.
Southwestern Iowa
Southwestern Iowa is a region of the U.S. state of Iowa that encompasses several counties, including Pottawattamie County, and is characterized by its mix of agricultural land, small cities, and proximity to the Missouri River and Omaha metropolitan area.
- 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: Iowa–South Dakota border Target entity description: 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.
-
A.
Siouxland region
The Siouxland region is a tri-state area in the upper Midwest of the United States, centered around Sioux City and encompassing parts of Iowa, Nebraska, and South Dakota.
-
B.
Iowa
Iowa is a Midwestern U.S. state known for its extensive agriculture, especially corn and soybean production, and its role in national politics through the Iowa caucuses.
-
C.
Nebraska–Iowa region
The Nebraska–Iowa region is a bi-state area in the central United States that encompasses communities and economic activity spanning the border between eastern Nebraska and western Iowa, including the Omaha–Council Bluffs metropolitan area.
-
D.
Yankton, South Dakota, United States
Yankton is a small city in southeastern South Dakota known as a historic Missouri River port and the birthplace of NFL kicker Adam Vinatieri.
-
E.
Southwestern Iowa
Southwestern Iowa is a region of the U.S. state of Iowa that encompasses several counties, including Pottawattamie County, and is characterized by its mix of agricultural land, small cities, and proximity to the Missouri River and Omaha metropolitan area.
- F. None of above. chosen
Statements (26)
| Predicate | Object |
|---|---|
| instanceOf |
political boundary
ⓘ
state border ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| crossesNearCity |
Sioux City, Iowa
ⓘ
Sioux Falls, South Dakota ⓘ |
| definedBy | course of the Big Sioux River ⓘ |
| establishedInPeriod | 19th century ⓘ |
| follows | Big Sioux River ⓘ |
| formsPartOf |
Iowa–South Dakota state line
ⓘ
linked to:
Iowa–South Dakota border
|
| hasAdjacentState |
Minnesota
ⓘ
Nebraska ⓘ |
| hasDirection | generally north–south ⓘ |
| hasHydrologicalFeature | Big Sioux River ⓘ |
| hasLegalStatus | interstate boundary ⓘ |
| hasNeighboringBorderSegment |
Iowa–Minnesota border
ⓘ
Iowa–Nebraska border ⓘ
linked to:
Nebraska–Iowa border
South Dakota–Minnesota border ⓘ
linked to:
Minnesota–South Dakota border
South Dakota–Nebraska border ⓘ
linked to:
Nebraska–South Dakota border
|
| locatedInRegion |
Midwestern United States
ⓘ
north-central United States ⓘ |
| partOf |
border of Iowa
ⓘ
border of South Dakota ⓘ |
| separates |
Iowa
ⓘ
South Dakota ⓘ |
| usedFor |
administrative division
ⓘ
jurisdictional division ⓘ |
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: Iowa–South Dakota border Description of subject: 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.
Referenced by (9)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Iowa–South Dakota border
linked to: Iowa–South Dakota border
linked to: Iowa–South Dakota border
linked to: Iowa–South Dakota border
linked to: Iowa–South Dakota border