Oregon's Borders: Pacific, Washington, Idaho, California, Nevada

Oregon is bordered by:

• West: Pacific Ocean (363 mi coastline)
• North: Washington (Columbia River forms much of border)
• East: Idaho (Snake River forms southern half)
• South: California (42nd parallel) and Nevada (short border at SE corner)

Key Border Features

• Columbia River – 300+ mi natural boundary with WA
• Snake River – forms OR-ID border south to Hells Canyon
• 42nd Parallel – straight-line border with CA/NV (surveyed 1860s)
• Maritime boundary – extends 3 nm into Pacific

One of 3 contiguous US states with Pacific coastline (WA, OR, CA).