Start by naming any country that France borders. Then name any country that borders any of those countries. Then keep going until there are no more countries left to name.
Good quiz but in my opinion - Washington D.C. is a bit of stretch. Washington is the name of the city, "District of Columbia" the federal district in which it resides.
Thank you @Robjohnson for the feedback. I thought about DC for a bit but eventually decided to include it because it is widely recognized (and pronounced and spelled) as two words.
I don't think either that Washington DC belongs here. Furthermore, Egypt is also questionable, since the Y in it is, in fact, a vowel, not a consonant.
Otherwise good quiz, keep up the good work!