Have a variable in my base url

I am working on making my site international and I want to be able to have the country code and language code in my base url.

If I create separate config files per different country and set the base url to include the country code, what would the name of the config file be? I tried this and I belive Hugo is expecting the language code in the name of the config file.

Want: www.mysite.com/us/en
Tried: config_us.yaml -> cannot find config file

This is the third topic you create about just about the same issue.