49°00′08″N 122°29′33″W / 49.002312°N 122.492623°W
0 Avenue (Zero Avenue) is a road in the Lower Mainland, British Columbia, running beside the Canada–United States border from Surrey to Abbotsford. The road runs parallel to the border between the two countries.
A boundary marker, border marker, boundary stone, or border stone is a robust physical marker that identifies the start of a land boundary or the change in a boundary, especially a change in direction of a boundary. There are several other types of named border markers, known as boundary trees, pillars, monuments, obelisks, and corners. Border markers can also be markers through which a border line runs in a straight line to determine that border. They can also be the markers from which a border marker has been fixed.