Region in name pattern

I’ve noticed in the documentation that in some cases you include the REGION in the name of resources, for instance for workspaces.

terraform {
  backend "remote" {
    organization = "ORG" # replace with your terraform cloud account org
    workspaces {
      name = "<%= expansion(':MOD_NAME-:ENV-:REGION-:INSTANCE') %>"
    }
  }
}

Is there a particular reason for including region in name of the resources? Or is it more to ensure the names are unique?

Thank you!