On state-owned land managed by Metsähallitus, metal detectors may be used under Everyman’s rights to locate metal objects. However, any disturbance of the soil requires the landowner’s prior consent. In protected areas, such consent may be granted only for scientific purposes. In wilderness reserves and in areas designated for protection but not yet formally established, permits are likewise grant ...
The website explains when a permit is required and where it can be applied for.