There are countries entirely inside other countries.
Why it is true
Vatican City is entirely within Italy, and Lesotho is entirely surrounded by South Africa, forming enclaves.
Source: Geography
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.