def _prompt_for_google_cloud_region(
    google_cloud_region: Optional[str],
) -> str:
  """Prompts user for Google Cloud region."""
  google_cloud_region = (
      google_cloud_region
      or os.environ.get("GOOGLE_CLOUD_LOCATION", None)
      or _get_gcp_region_from_gcloud()
  )

  google_cloud_region = _prompt_str(
      "Enter Google Cloud region",
      default_value=google_cloud_region or "us-central1",
  )
  return google_cloud_region
Prompts user for Google Cloud region.
src/google/adk/cli/cli_create.py