What are some example of natural and artificial boundaries?

Natural boundaries are physical features that separate regions, such as rivers, mountains, and lakes; for example, the Mississippi River serves as a natural boundary between several U.S. states. Artificial boundaries, on the other hand, are man-made lines often established through treaties or negotiations, such as the borders between countries like the United States and Canada. These boundaries can be straight lines or follow specific coordinates, regardless of the physical landscape.