There is more than one definition for the length of a league. The English define a league as 4.8 km, while the French measurement ranges from 3.3 km to 4.7 km. The reason for this discrepancy is because a league refers to the distance a man on a horse can travel in one hour.
The Atlantic Ocean is 8.6 km at it deepest point (the Puerto Rico Trench). By the English league, that would make it about 1.79 leagues deep. By the French definition, the Atlantic is 1.83 to 2.61 leagues deep.
In the book Twenty Thousand Leagues Under the Sea, Jules Vern used the measurement of 4km as one league.
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