https://aws.amazon.com/blogs/security/how-to-replicate-secrets-aws-secrets-manager-multiple-regions/
With Secrets Manager, you can store, retrieve, manage, and rotate your secrets, including database credentials, API keys, and other secrets. When you create a secret using Secrets Manager, it’s created and managed in a Region of your choosing. Although scoping secrets to a Region is a security best practice, there are scenarios such as disaster recovery and cross-Regional redundancy that require replication of secrets across Regions. Secrets Manager now makes it possible for you to easily replicate your secrets to one or more Regions to support these scenarios.