20000 Leagues Under The Sea

The title refers to the distance traveled while under the sea and not to a depth, as 20,000 leagues is over six times the diameter, and nearly twice the circumference of the Earth. The greatest depth mentioned in the book is four leagues. The book uses metric leagues, which are four kilometres each. A literal translation of the French title would end in the plural "seas", thus implying the "seven seas" through which the characters of the novel travel; however, the early English translations of the title used "sea", meaning the ocean in general.