specific-region-policy

# https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_examples_aws_deny-requested-region.html
# DenyAllOutsideUsEast1ExceptAllowingS3


{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "DenyAllOutsideUsEast1ExceptAllowingS3",
            "Effect": "Deny",
            "NotAction": [
                "s3:*"
            ],
            "Resource": "*",
            "Condition": {
                "StringNotEquals": {
                    "aws:RequestedRegion": [
                        "us-east-1"
                    ]
                }
            }
        }
    ]
}