What are natural features that act as divisions between areas called?

Natural features that act as divisions between areas are referred to as physical boundaries. These include mountains, rivers, valleys, and other geographical features that naturally demarcate different regions or territories. Physical boundaries often play a significant role in influencing human settlement, land use, and political divisions because they are naturally occurring and can be easily identified in the landscape.

In contrast, human boundaries are established by people and can change over time, reflecting social, political, and historical contexts. Cultural boundaries relate to differences in language, ethnicity, and religion, which can influence how societies are organized and interact, but do not necessarily correspond to physical landscapes. Political boundaries specifically refer to borders created through legal and political agreements, often disregarding the natural features of the land. Thus, the distinction of physical boundaries being based on tangible, geographical elements makes them the correct answer in this context.