The 49th parallel north is the boundary between which two countries?
- A.United States and Mexico
- B.United States and Canada
- C.Russia and China
- D.France and Spain
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Explanation
The correct answer is B, the United States and Canada. A long stretch of the border between the United States and Canada, from the Lake of the Woods to the Strait of Georgia, follows the 49th parallel of north latitude, which is why that part of the frontier appears as a perfectly straight line on any map; a boundary drawn in this way is called a geometrical boundary. Option A, the United States and Mexico, are divided in part by the Rio Grande, a river boundary, not by a parallel. Option C, Russia and China, share a long border that follows the Amur and Ussuri rivers in the east. Option D, France and Spain, are divided by the crest of the Pyrenees, a mountain boundary. The parallels worth memorising together are the 17th for Vietnam, the 38th for Korea and the 49th for North America.