Claim: Tyrifjorden is a wetland area located in Viken, Norway, has a surface area of 139 kilometers and an average depth of 97 meters.
Evidence: Viken, Norway Nordre Tyrifjord Wetlands System It lies 40 kilometres (25 mi) northwest of Oslo and is the nation's fifth largest lake with an area of 139 km. 97 m (318 ft)