Between 2010 and 2015, Metsähallitus carried out a field survey of cultural heritage sites in multiple-use forests owned by the Finnish government. The project was part of the National Forest Programme 2015. Nearly four million hectares of managed forests, forest land of low productivity and non-productive land were surveyed. The project was the largest field survey of cultural heritage in the history of Finland, and the first to identify and protect in the forests the cultural heritage of later periods.