Which of the following is an example of a cultural or geometric boundary rather than a natural boundary?

• A. A border drawn as a straight line along latitude.
• B. A river boundary between two states.
• C. A mountain range forming a border.
• D. A coastline formed by ocean dynamics.

Answer: (A)

A border drawn as a straight line along latitude exemplifies a cultural or geometric boundary because it’s defined by human-imposed coordinates rather than by the natural landscape. This kind of boundary uses a grid or plan—latitudes and longitudes—to separate areas, reflecting political decisions, treaties, or administrative convenience rather than the geography itself.

In contrast, a river boundary follows a natural feature, a mountain range acts as a boundary because the terrain itself forms a barrier, and a coastline boundary is shaped by ocean dynamics. These are rooted in the environment, not in human-imposed geometry, so they’re natural boundaries rather than cultural or geometric ones.