Abstract: National borders are important parts of the maps. Latitude and longitude lines are used not only to determine location and direction, but also to divide national boundaries between countries. The national borders drawn on the map must not only comply with the laws and legislations, treaties and standards, but also properly handle the relationship between the national borders and the longitude and latitude lines. By introducing the basis for drawing the national boundary lines in the map, the key areas where the relationship between the national boundary line and the longitude and latitude lines are prone to error can be used as a reference for map drawing and map clearance.

Key words: map, national borders, latitude and longitude lines, representation method