What type of boundary is defined by straight lines drawn on maps, not by natural or cultural features?

• A. Natural Boundaries
• B. Ethnic Boundaries
• C. Physical Boundaries
• D. Geometric Boundaries

Answer: (D)

The boundary type being described is defined by straight lines drawn on maps rather than by physical terrain or by how people are distributed. This is a geometric approach to borders, where lines of latitude, longitude, or other fixed coordinates create the edge, rather than following rivers, mountains, or ethnic/cultural divisions. Geometric boundaries are common in treaties and colonial-era agreements because they offer clear, administratively convenient lines on a flat map. A classic example is the portion of the US–Canada border along the 49th parallel, a straight-line border formed by coordinates rather than natural features or population patterns. Since the question specifies straight lines and map-defined boundaries, this type best fits.