Below is the list of available environment in AEM Cloud:
The set of available regions will vary based on capacity and entitlements, so always check this list before creating an environment. The superset of possible regions are:
aus5
- Australia Southeastcan2
- Canadadeu6
- Germanygbr9
- UK Southjpn4
- Japannld2
- West Europesgp5
- Singaporeva7
- East USwa1
- West US
Reference:
https://developer.adobe.com/experience-cloud/cloud-manager/guides/api-usage/creating-programs-and-environments/