How is a bioregion defined?

A bioregion is defined by natural characteristics such as climate, geography, vegetation, and ecosystems. This definition reflects the idea that bioregions are delineated based on the ecological and environmental processes that shape the flora and fauna of an area. Factors like climate patterns, soil types, topography, and the types of organisms present play crucial roles in determining the boundaries of a bioregion.

In contrast, human population density is a social aspect and does not reflect ecological regions. Geographical borders, while they may coincide with bioregions, are not sufficient on their own to define them because they can be arbitrary and do not account for the ecological processes. Similarly, economic activities do not define bioregions, as they can vary widely and might not correspond to ecological boundaries. Thus, the definition that focuses on natural characteristics provides the most accurate representation of what constitutes a bioregion.