Vmware cloud on AWS is Vmware SDDC software stack (Vsphere | NSX | VSAN) running on AWS hardware.
AWS has a concept of Regions and AZ. AZs are like datacenters in a particular region. Fore more details please refer - Global Cloud Infrastructure | Regions & Availability Zones | AWS
AWS doesn't publish the location of these datacenters. However, AZs are located within a region.
Example.
Asia Pacific has a Mumbai region.
and that region has 2 AZs aka Data centers. So you can imagine that these 2 Data centers wouldn't be very far off.
For exact details on the distance between 2 AZs, you would need to reach out to AWS (assuming they publish that data to you under NDA)