In some

geomorphological Geomorphology (from Ancient Greek: , ', "earth"; , ', "form"; and , ', "study") is the scientific study of the origin and evolution of topographic and bathymetric features created by physical, chemical or biological processes operating at or ...

taxonomies, a mesoregion is a

natural region A natural region (landscape unit) is a basic geographic unit. Usually, it is a region which is distinguished by its common natural features of geography, geology, and climate. From the ecological point of view, the naturally occurring flora an ...

of intermediate size. Mesoregions may be defined on the basis of morpholithogenic conditions and spatial connection.Recent Landform Evolution: The Carpatho-Balkan-Dinaric Region, edited by Dénes Lóczy, Miloš Stankoviansky, Adam Kotarb
p. 325
/ref> A mesoregion is used in the regionalization of the area, it is a physical and geographic division unit, it is part of a macroregion, and consists of microregions.

References

Geomorphology {{geomorph-stub