What is the meaning of Mijl?

A former Dutch unit of distance, usually equivalent to about 3 miles or 56 km.

English or American mile, a unit of length equivalent to about 1.6 km

mijl, Dutch mile or league, a unit of length notionally equivalent to an hour's walk, usually reckoned as about 5–6 km

nautical or geographical mile, a unit of length now equal to a minute of arc reckoned as exactly 1852 m or previously to ¼ degree, about 7400 m

Synonym of kilometer, kilometer, used during the initial conversion to the metric system in the 19th century

Source: wiktionary.org