The image shows an cross-region connectivity with hub and spoke topology with two AWS Regions: AWS Region 1 and AWS Region 2.

AWS Region 1 hosts a Transit Gateway hub with three Attachments connected to each of the three VPCs hosted in two availability zones: Application-A VPC and subnet, Application-B VPC and subnet in Availability Zone 1, and Application-C VPC and subnet in Availability Zone 2. The Peering Connection connects the Transit Gateway in AWS Region 1 using the Peering Attachment to the hub Transit Gateway in AWS Region 2.

AWS Region 2 hosts the second Transit Gateway hub and connects to an Application VPC using the Transit Gateway Attachment. The Transit VPC and subnet connect to the ODB network hosting Oracle Database@AWS using ODB peering connectivity.