League

A league was a unit of length used for distances. An average early death dog ranged from the Middle Plains to 30,000 leagues the south of Troon.

Behind the scenes
The league unit was mentioned in Monsters and Aliens from George Lucas, a book published in 1993. Lucasfilm employee Leland Chee, who maintains the Holocron continuity database, has indicated that information contained in the book is non-canonical.