The geographic feature indicating the border between the United States and Canada is the 49th Parallel. This border is largely defined by the latitude line marking 49 degrees north and extends from the Great Lakes to the Pacific Ocean. It is one of the longest international borders in the world, spanning approximately 5,525 miles. The 49th Parallel facilitates trade and travel between the two countries, symbolizing strong diplomatic relations. Various cities and communities straddle this border, enhancing cultural exchanges and economic collaboration.