"Vikings" are taking to the water to raise money for a south Cumbria museum hoping to house a newly-acquired treasure hoard.
A metal detector enthusiast found Viking silver coins and ingots near Stainton, Dalton, in 2010.
Barrow Dock Museum raised £50,000 to buy the hoard, and now wants to build a special Viking gallery.
Re-enactor warriors are rowing a replica longboat around Derwent Water to raise the cash.
The team, from Herlid Vikings group, will set off from Lodore
to the Keswick boat landing, where they will hold a combat display.