A bioprovince is a biozone which is a subdivision of a bioregion.

A palaeobioprovince is a prehistoric bioprovince - a biozone which is a subdivision of a bioregion.

The Sierra Nevada Bioregion is part of the United States. It extends from the Feather River in the north to Tejon Pass in the south. It is bounded on the west by the Central Valley Bioregion and on the east by the Intermountain and Mojave Desert Bioregions. It encompasses desert, mountains, and various other forms of plant and animal life.

A bioregionalization is the specification of the bioregions of an area.

Cascadia was never a country. It is a bioregion in the Pacific Northwest of North America that encompasses parts of the United States and Canada.