AWS GovCloud (US) Regions are designed to host sensitive data, regulated workloads, and address the most stringent U.S. government security and compliance requirements. With today’s release, Route 53 now enables customers in the AWS GovCloud (US-East and US-West) Regions to define AWS Identity and Access Management (IAM) create, edit, and delete policies for individual or groups of DNS record sets within a Route 53 private hosted zone.
Source:: Amazon AWS