Aalsum is a small hamlet in the Dutch province of Groningen. It is located in the municipality of Westerkwartier, about 1.5 km west of Oldehove. The hamlet was located on a wierde, an artificial dwelling hill. The hill was partially excavated in the 20th century; a bow from the ninth century was found. Plans to reconstruct the hill were canceled. According to the 19th-century historian A.J. van der Aa, Aalsum had 80 inhabitants in the middle of the 19th century; presumably, this includes the surrounding countryside.

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