Level 300: Testing for Resiliency of EC2, RDS, and AZ :: AWS Well-Architected Labs
https://wellarchitectedlabs.com/reliability/300_labs/300_testing_for_resiliency_of_ec2_rds_and_s3/
What to Consider when Selecting a Region for your Workloads | Amazon Web Services https://flip.it/-J5KVo