The US has border lines WITH (not IN ) Canada.
2
The are called Contour Lines.
purabachal
The master cylinder.
contour lines
contour lines
Lines of longitude stay right there where they are at. Each of them connects the north and south poles.
DSLAM
A geometric border is made by the lines of latitude and longitude, the United States has mostly a goemetric border with Canada.
Hawaii
Border