Which country has no vowels?

This is a bit of a trick question! There's no country that has absolutely *no* vowels in its name. Every country name will have at least one vowel.

It's possible you're thinking of the word "rhythm" which is a word in the English language that is often cited as an example of a word without vowels. However, even "rhythm" has a vowel sound in it, as the "y" acts as a vowel in this case.