In the Netherlands, it was frequently used in the Achterhoek, Twente, and some parts of Drenthe to estimate areas of land, particularly in agriculture. Traditionally it had different values in different regions, but since the adoption of the metric system it has been defined to be equal to one hectare.
In Belgium, a bunder was used as unit of area in the part of the country historically belonging to the Holy Roman Empire (i.e. east of the Scheldt). In general, one bunder was 1/12 of a mansus. During the French occupation (1796–1815) the old measurement standards were accurately converted to the metric system. A general standard like the one in the Netherlands (1 bunder = 1 hectare) has never been adopted in Belgium.
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- Bunder at sizes.com
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