The 42nd parallel forms the southern boundary of Idaho. It marks the border between Idaho and Nevada as well as a portion of the border between Idaho and Oregon.
The only state with part of its boundary defined by the arc of a perfect circle is Wyoming. The eastern boundary of Wyoming follows the 42nd parallel north latitude line, which forms part of a perfect circle around the Earth.
Spain is the only country to border Portugal to the east.
A mid-latitude cyclone typically forms along a stationary front or a frontal boundary where warm and cold air masses meet. This is called a wave cyclone, and it is common in mid-latitude regions.
Animal cells do not have cell walls, so the plasma membrane forms the outside boundary that separates the cell from its environment.
The 42nd parallel forms the southern boundary of Idaho. It marks the border between Idaho and Nevada as well as a portion of the border between Idaho and Oregon.
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The Potomac river
The southern half of the eastern boundary of Alabama is the Chattahoochee River.
The Mediterranean Sea
The parallel of latitude approximately 66°33′ north. It forms the boundary between the North Temperate and North Frigid zones.
The Atlantic Ocean forms the eastern boundary of the Southeast, while the Gulf of Mexico forms the southern boundary.
The Ohio River forms Ohio's southern border.
Baffin Bay forms a natural boundary between Greenland (an autonomous territory of Denmark) and Baffin Island (part of the Canadian territory of Nunavut).
Most of the northern boundary is formed by the Alps. However, on the Iberian Peninsula, the Pyrenees form another northern border of Southern Europe.
Both Chile and Argentina, close to Antarctica.
Ohio River