The Kleilânsmole is an historic water mill located on Hoog Herenweg in the town of Marrum. The mill was originally built in 1865 in the town of Foswerd, but was later moved to Marrum, where it was responsible for the De Tran polder. The Kleilânsmole was bought by the Frykse Mill Foundation in 1976. The foundation own several mills in the area, and are responsible for the conservation of historic mills. The mill is currently in a very poor condition, and is awaiting restoration work.