A region is a geographical area where you can run your VPC service.
Each region comprises one or more AZs and is completely isolated from other regions. AZs within the same region can communicate with one another through an internal network, while those in different regions cannot communicate with one another through an internal network.
The public cloud system is hosted in multiple locations worldwide, such as in North America, Europe, and Asia. The VPC service hence can be provided in different locations. You can create VPCs in locations that meet your requirements. For example, you can create VPCs to design applications in a region that is closer to your customers or that can meet legal or other specific requirements.