Oregon–Washington state line

E1205807 UNEXPLORED

The Oregon–Washington state line is the boundary separating the U.S. states of Oregon and Washington, running largely along the Columbia River and defining their shared jurisdiction.

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All labels observed (5)

Label	Occurrences
Oregon–Washington border	2
Oregon state line	1
Oregon state line near Milton-Freewater	1
Oregon–Washington state line canonical	1
Washington–Oregon state line	1

How this entity was disambiguated

This entity first appeared as the object of triple T16299826 — 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: Oregon–Washington state line
Context triple: [McNary Lock and Dam, isOnBorderOf, Oregon–Washington state line]

A. Oregon–Idaho border
The Oregon–Idaho border is the interstate boundary in the northwestern United States that largely follows natural features such as the Snake River and includes the deep gorge of Hells Canyon.
B. Oregon–California border
The Oregon–California border is the state line separating Oregon and California in the western United States, running from the Pacific coast inland across diverse terrain including mountains, forests, and river valleys.
C. La Grande, Oregon
La Grande, Oregon is a small city in northeastern Oregon that serves as a regional hub for Eastern Oregon and is home to Eastern Oregon University.
D. Northwestern Oregon
Northwestern Oregon is a region of the U.S. state of Oregon that includes the Portland metropolitan area and surrounding communities near the Columbia River and Pacific Coast.
E. The Dalles–Celilo reach of the Columbia River
The Dalles–Celilo reach of the Columbia River is a historically and culturally significant stretch of the river in the Pacific Northwest, once renowned for its powerful rapids and rich Indigenous fishing sites before being largely submerged by dam construction.
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: Oregon–Washington state line
Target entity description: The Oregon–Washington state line is the boundary separating the U.S. states of Oregon and Washington, running largely along the Columbia River and defining their shared jurisdiction.

A. Oregon–Idaho border
The Oregon–Idaho border is the interstate boundary in the northwestern United States that largely follows natural features such as the Snake River and includes the deep gorge of Hells Canyon.
B. Oregon–California border
The Oregon–California border is the state line separating Oregon and California in the western United States, running from the Pacific coast inland across diverse terrain including mountains, forests, and river valleys.
C. La Grande, Oregon
La Grande, Oregon is a small city in northeastern Oregon that serves as a regional hub for Eastern Oregon and is home to Eastern Oregon University.
D. Northwestern Oregon
Northwestern Oregon is a region of the U.S. state of Oregon that includes the Portland metropolitan area and surrounding communities near the Columbia River and Pacific Coast.
E. The Dalles–Celilo reach of the Columbia River
The Dalles–Celilo reach of the Columbia River is a historically and culturally significant stretch of the river in the Pacific Northwest, once renowned for its powerful rapids and rich Indigenous fishing sites before being largely submerged by dam construction.
F. None of above. chosen