How do I navigatin nested json data

Question

I need a little help with navigating a json file.

I'm looking to get all the country names from a return like this:

[{"country":
    {
     "225":["United Kingdom","Europe"],
     "206":["Switzerland","Europe"],
     "176":["Romania","Europe"],
     "127":["Madagascar","AMEA"],
     "217":["Tunisia","AMEA"]
    }
  }]

How would I get to this when I don't know or have a list of the 225, 206...etc?