Opuntia is a species of cactus.
Vietnam
America
England
Austria
Out of those letters, I'd try America.
BAHAMAS
Denmark.
A desert wanderer is called a Nomad.
In whichever country the desert is located is 'owned' by that country.
There is no such country. There is no country that starts with A and ends with T, let alone a 7-lettered one.
There is no Cheech Desert in any country.