A tønne (plural tønner)[1] is an old Norwegian unit of volume equivalent to a barrel.
The volume of a tønne has varied over time in Norway, including many local variations.
[1] A dry tønne was divided into four fjerdinger, equivalent to 34.71 liters (0.985 U.S. bu) each.
[4] In addition, the term tønne (a "barrel of land") was used as a measurement of area equivalent to 3,937 square meters (0.973 acres).
This corresponded to the amount of land that could be sown with one tønne of seed.