Region does not seem to be available for aws module boto. If the region definitely exists, you may need to upgrade boto or extend with endpoints path .
Allow using endpoint heuristics to guess endpoints for regions that aren’t built in. So, you can use one of the following methods to resolve this issue.
1- Specify BOTO_USE_ENDPOINT_HEURISTICS as an environment variable:
~/.boto as below:
$ vi ~/.boto [Boto] use_endpoint_heuristics = True
You have learned how to resolve the problem of not available regions, if you need more helps you can take a look to boto official documentation. You might want to check the following guides: