This isn't a country, it's an African tribe originating in southern and central Africa. This tribe includes Nelson Mandela as one of it's most illustious members.
The reason I've included it in this list is for any English teacher (or anyone else for that matter) who may be interested in practicing countries by going through the alphabet - when I first tried to do this, I was frustrated when I got to the letter 'X' because no country existed for this letter! :-)