RegionString:
| "us-west-2"
| "us-west-1"
| "us-east-2"
| "us-east-1"
| "ap-south-1"
| "ap-northeast-2"
| "ap-northeast-1"
| "ap-southeast-1"
| "ap-southeast-2"
| "ca-central-1"
| "cn-north-1"
| "eu-central-1"
| "eu-west-1"
| "eu-west-2"
| "eu-west-3"
| "sa-east-1"
| "us-gov-west-1"
| "ap-east-1"
| "ap-southeast-3"
| "ap-northeast-3"
| "eu-south-1"
| "eu-north-1"
| "me-south-1"
Represents all AWS Regions