60 degrees north latitude
The 42nd northern latitude
The Cell Membrane forms the outside boundary that separates the cell from its environment.
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A convergent plate boundary where subduction occurs.
The 42nd northern latitude
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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 Ohio River forms Ohio's southern border.
Both Chile and Argentina, close to Antarctica.
Ohio River
Most of the northern boundary is formed by the Alps. However, on the Iberian Peninsula, the Pyrenees form another northern border of Southern Europe.
The Mediterranean Sea is the body of water that forms the southern boundary of Europe. If a person crosses the Mediterranean Sea to the south they will reach the continent of Africa.
The Potomac River divides Maryland and Virginia (The Southern Border) , but Virginia does not own half of the Potomac River.