Second, the term regions is used to categorise areas around the globe with common topographical characteristics or biological characteristics. For example, Chapter 2 introduces regions in its discussion of biomes, as in arid, grassland, savanna, tundra regions, tropical, temperate and boreal forested regions. Chapter 3 adds reference to an area's orientation with bodies of water, using terms such as deltaic, coastal, intercoastal, freshwater and salty. On top of this, Cross-Chapter 2 uses a coastal region typology based on physical geomorphology considering elevation, coastal type and topography . 
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report