History of Oceania

If a league is equal to about three miles how long and wide the island?

A league is a unit of distance that varies in length depending on the context in which it is used. In the context of measuring land distances, a league is typically considered to be equivalent to about three statute miles (4.8 kilometers). However, the length of a league can vary from place to place and from time period to time period, so it is important to consider the specific context in which the term is used.

Without further information about the specific context in which the term "league" is being used, it is not possible to determine the exact length and width of the island.