This is a stretch of about 600 miles, and is a territory that shares more than a line on a map. When you drive the Hi-Line, Montana Highway 2, you are only 40 to 50 miles from Canada at any time.

Controversial buoy barriers that have been used along the southern border may also be deployed along the U.S.-Canada border, ... a Montana lake that stretches into Canada. ... the CBP road map.