Definition of "boundary line" []

• A line that indicates a boundary (noun)

WordNet. Princeton University. 2010.

• "Between his northeastern zone and his southeastern zone Martin drew a boundary line just south of the Mangoro River, which flows eastward off the escarpment about halfway between Analamazaotra and Ranomafana."
• "Within minutes, the jagged peaks of the Zagros Mountains rose up before them, the boundary line between Iraq and Iran."
• "Mr. Herman, one of the first settlers in the 4th Concession of Adolphustown, bought a farm, which happened to be situated on the boundary line between the above-named township and Fredericksburgh, in those days known as 3rd and 4th town."