How do you design a multi region architecture, and what are the key challenges involved compared to a multi Availability Zone design within a single region?

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Accepted Answer

A multi region architecture involves running resources across entirely separate geographic AWS Regions, typically for disaster recovery, regulatory compliance across different countries, or to reduce latency for globally distributed users, but it introduces additional challenges compared to a single region multi Availability Zone design, including higher data transfer costs between regions, more complex data replication and consistency considerations, and the need to manage separate resource deployments since most AWS resources do not automatically span multiple regions.