Here's why:

* Physical Features: Regions are defined by shared characteristics like climate, landforms (mountains, plains, etc.), vegetation, water bodies, and soil types.

* Commonality: These features create a sense of unity and distinction from other areas.

* Examples: The Great Plains of North America, the Amazon rainforest, or the Sahara Desert are all examples of regions defined by common physical characteristics.

Other terms you might encounter include:

* Physiographic Region: This term emphasizes the landforms and geological structures that define a region.

* Biome: This term is used for large-scale ecological regions characterized by distinct plant and animal communities adapted to the specific climate and environment.

Ultimately, the most accurate term depends on the specific context and the level of detail being discussed.