regions don't have defined boundaries
Yes, regions can overlap when they share boundaries or have areas that are common to both regions. Overlapping regions are common in geospatial analysis, political boundaries, and environmental studies where features can exist in multiple regions simultaneously.
There are a few different ways that regions are formed. Regions are formed based on boundaries that are placed based on population for example.
congress
convergent plate boundaries
anything that is important to study
There are very rarely distinct boundaries where a region abruptly changes.
A "geopolitical" map.
Political boundaries are the boarders of a country. Geographic regions are like deserts, tundra, and grasslands.
opinions about regions
Climate regions often do not have clear boundaries, as they can blend into one another gradually. Factors like temperature, precipitation, and vegetation can change gradually over a large area, leading to transitional zones between different climate regions. However, specific climate boundaries can be identified based on distinct changes in weather patterns and environmental conditions.
The two basic types of regions are formal regions and functional regions. Formal regions are defined by a common characteristic, such as language or political boundaries. Functional regions are defined by their connections or interactions, such as a city and its surrounding suburbs.
The two general types of regions mentioned in text are formal regions, which are defined by official boundaries and characteristics, and functional regions, which are defined by interactions and connections among places.