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.
I liked the quiz! Definitely assumed, since we were looking for the "bottom" country for highest elevation as the country with the "lowest" highest elevation, that the "bottom" country for lowest elevation would be the country with the "highest" lowest elevation, e.g. Lesotho I think for Africa. But course corrected fairly quickly