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A measurement of distance, long defunct. A league at sea measured 3.18 nautical miles, or 5.8 kilometres, the equivalent of 4 Roman miles, though, for practical purposes, it was taken as 3 nautical miles. Leagues on land had different values according to the country, ranging from a minimum of 3.8 kilometres to a maximum of 7.4 kilometres (2.4–4.6 statute miles).

Subjects: Maritime History.

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