As climate change is a multi-scale phenomenon from the local to the global, the assessment of climate risks and climate change impacts is strongly spatial, with a focus on regional climate change. The term 'regions' is used in different ways throughout the interdisciplinary AR6 assessment as the use of the term varies across disciplines. It is alternately used to point to a particular geography, relate physical distance or proximity, or categorise areas based on common biological, topographical characteristics, or elevation in relation to sea level. Its meaning depends on context. 
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report