Nebraska–Iowa border
E117633
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.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Iowa–Nebraska border | 2 |
| Nebraska–Iowa border canonical | 2 |
| Iowa–Nebraska state line | 1 |
| Nebraska–Iowa state line | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T989678 — 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–Iowa border Context triple: [Missouri River, USStateBorderFor, Nebraska–Iowa border]
-
A.
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.
-
B.
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.
-
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.
Alabama–Mississippi border
The Alabama–Mississippi border is the state line separating Alabama and Mississippi in the southeastern United States, running through rural areas, forests, and river crossings.
-
E.
eastern Nebraska
Eastern Nebraska is a region of the U.S. state of Nebraska centered around the Omaha–Lincoln corridor, known for its relatively dense population, diversified economy, and role as the state’s primary commercial and cultural center.
- 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–Iowa border Target entity description: 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.
-
A.
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.
-
B.
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.
-
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.
Alabama–Mississippi border
The Alabama–Mississippi border is the state line separating Alabama and Mississippi in the southeastern United States, running through rural areas, forests, and river crossings.
-
E.
eastern Nebraska
Eastern Nebraska is a region of the U.S. state of Nebraska centered around the Omaha–Lincoln corridor, known for its relatively dense population, diversified economy, and role as the state’s primary commercial and cultural center.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
interstate boundary
ⓘ
state border ⓘ |
| adjacentTo |
Missouri–Iowa border
ⓘ
Nebraska–South Dakota border ⓘ Iowa–South Dakota border ⓘ
surface form:
South Dakota–Iowa border
|
| borderOfState |
Iowa
ⓘ
Nebraska ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| crossedBy |
Interstate 29
NERFINISHED
ⓘ
Interstate 680 ⓘ Interstate 80 ⓘ U.S. Route 20 NERFINISHED ⓘ U.S. Route 30 ⓘ U.S. Route 6 NERFINISHED ⓘ U.S. Route 75 NERFINISHED ⓘ U.S. Route 77 NERFINISHED ⓘ |
| directionEastSide | Iowa ⓘ |
| directionWestSide | Nebraska ⓘ |
| followsRiver | Missouri River ⓘ |
| formedBy | course of the Missouri River ⓘ |
| geographicOrientation | generally north–south ⓘ |
| governingAuthorityEast |
Iowa
ⓘ
surface form:
State of Iowa
|
| governingAuthorityWest |
Nebraska
ⓘ
surface form:
State of Nebraska
|
| hasBorderCity |
Council Bluffs
ⓘ
surface form:
Council Bluffs, Iowa
Omaha, Nebraska ⓘ Sioux City, Iowa ⓘ South Sioux City, Nebraska ⓘ |
| hasBoundaryType | fluvial boundary ⓘ |
| hasHistoricalIssue | river course changes affecting jurisdiction ⓘ |
| hasHydrologicalContext |
Missouri River Basin
ⓘ
surface form:
Missouri River basin
|
| hasMajorCrossing |
Missouri River bridge between Omaha and Council Bluffs
ⓘ
Missouri River bridge near South Sioux City and Sioux City ⓘ |
| hasNaturalBoundaryFeature | river boundary ⓘ |
| isPartOf |
borders of Iowa
ⓘ
borders of Nebraska ⓘ |
| legalDefinitionBasedOn |
Missouri River
ⓘ
surface form:
Missouri River channel
|
| locatedInRegion | Midwestern United States ⓘ |
| partOf |
Iowa state boundary
ⓘ
Nebraska state boundary ⓘ |
| separates |
Iowa
ⓘ
Nebraska ⓘ |
| usedFor |
congressional district delimitation
ⓘ
law enforcement jurisdiction ⓘ state jurisdiction delimitation ⓘ taxation jurisdiction ⓘ |
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–Iowa border Description of subject: 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.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Nebraska–Iowa state line
this entity surface form:
Iowa–Nebraska border
this entity surface form:
Iowa–Nebraska border
this entity surface form:
Iowa–Nebraska state line