Sukulanrakka Giant's Kettles are a group of glacial potholes on wooded slopes near Rautiosaari. Fourteen kettles have been identified, including several deep examples formed by stones swirling in meltwater at the end of the Ice Age.
The nature trail includes stairs and rougher sections, so it is a better fit for walkers than casual drive-by sightseeing. There is no easy public transport, making it simplest with a car.