Which State Borders Both Idaho and Washington? Quiz

Quiz challenge

Name the state that borders both Idaho and Washington.

A Nevada B Wyoming C Montana D Oregon

Select an answer to continue.

The Pacific Northwest is famous for its dramatic coastlines, rugged mountain chains, and sprawling river basins. In this region, geographic boundaries are often defined by prominent natural features such as rushing rivers and deep canyons. Determining how neighboring states connect requires a close look at the physical map of the American West. Testing your knowledge of state borders can be tricky, especially where narrow land strips and river corridors shape state lines.

The correct answer

D) Oregon

Oregon is the correct answer. It is the only state in the nation that borders both Washington to its north and Idaho to its east.

Oregon shares direct land and water borders with both Washington and Idaho. Its northern boundary with Washington is defined for most of its length by the Columbia River before extending along a straight geographic latitude line farther east. To the east, Oregon is bounded by Idaho, where the winding Snake River and the deep gorge of Hells Canyon form a significant portion of the dividing border. Because Oregon sits directly south of Washington and directly west of Idaho, it serves as a geographic bridge between the two states in the Pacific Northwest.

Why each choice fits—or doesn’t

A) Nevada

Why it is not the answer: Nevada is located south of Oregon and Idaho. While Nevada shares an extensive border with Oregon to its north and Idaho to its northeast, it does not touch Washington at all. Washington lies much farther north, separated from Nevada by the entire north-south width of Oregon.

B) Wyoming

Why it is not the answer: Wyoming is situated in the Mountain West region and shares a boundary with Idaho along Idaho's eastern side. However, Wyoming does not border Washington or Oregon. Multiple states and hundreds of miles of terrain lie between Wyoming's western border and the state of Washington.

C) Montana

Why it is not the answer: Montana shares a long western border with Idaho, but it does not reach Washington. A common misconception is that Montana and Washington touch, but the narrow northern extension of Idaho known as the Idaho Panhandle completely separates Montana from Washington's eastern border.

D) Oregon

Correct choice: Oregon is correct because it shares a northern border with Washington along the Columbia River and an eastern border with Idaho along the Snake River. This unique geographic positioning makes Oregon the only state to touch both neighboring Pacific Northwest states.

More context

The boundaries defining Oregon, Washington, and Idaho were established during the nineteenth century as territorial claims evolved in the Pacific Northwest. Originally, the vast Oregon Territory encompassed the entirety of present-day Oregon, Washington, and Idaho, along with parts of Montana and Wyoming. As settlement expanded, Congress divided the region into smaller administrative territories. When Oregon was admitted to the Union as the thirty-third state in 1859, its boundaries were established along forty-six degrees north latitude and the Columbia River to the north, and forty-two degrees north latitude to the south. The Snake River was designated as part of its eastern limit. When Washington Territory was later carved out and eventually granted statehood in 1889, and Idaho in 1890, these established survey lines and river channels remained as official state borders. Today, travelers crossing from Oregon into Washington often traverse iconic bridges over the Columbia River, while those entering Idaho navigate the rugged canyon country carved by the Snake River.

Quick facts

The Columbia River forms roughly three hundred miles of the state boundary between Oregon and Washington.
Hells Canyon along the Oregon-Idaho border is the deepest river gorge in North America, plunging deeper than the Grand Canyon.
Oregon was admitted as the thirty-third U.S. state on February 14, 1859.
The Idaho Panhandle prevents Montana from sharing a border with Washington.

Sources

Ground Water Atlas of the United States: Segment 7, Idaho, Oregon, Washington — U.S. Geological Survey Oregon shares physical boundaries with Washington along the Columbia River and with Idaho along the Snake River.
Oregon | Geography, History, Capital, Map, Population, & Facts — Encyclopædia Britannica Oregon is bounded to the north by Washington state and to the east by Idaho.