...
Delete virtual infrastructure, such as virtual datacenters and storage volumes defined within the public cloud region. For more information, see Manage virtual datacenters.
To delete a public cloud region
Go to Infrastructure → Public
Select public cloud region and click the trash bin delete button in the button bar at the top right bottom of the DATACENTERS screen. Datacenters list
When you delete a public cloud region, the remote services will be detached from the public cloud region, but not deleted from the platform.
...