Generally obsolete. There are 3 statute miles in one league, however there are many different definitions that vary from ~2.4 to 4.6 miles per league depending on the period in history and country. A marine league is 3 nautical miles
Interactive Learning Paradigms Incorporated ILPI (Knowledge at the Speed of Light), The MSDS Hyper Glossary (Home Page of the Material Safety Data Sheet Hyper Glossary), ILPI, NJ, USA 2011. http://www.ilpi.com/msds/ref/index.html, (MSDS - Amer) {448}