An original open-air museum created to save the floating boom that, until 1985, was used to group and sort tree trunks as they floated down the Glomma. It is made up of 2.5km of floating waterways, a forge and a presentation of the tools used to manoeuvre the trunks. The museum is linked to a nature information centre by paths alongside the bank and over the water. The Glomma meets Lake Øyeren, downstream from Fetsund Lenser, forming the country's largest interior estuary.