federal land management land at least 10 percent stocked by forest trees of any size, including land that formerly had such tree cover and that will be naturally or artificially regenerated —note 1. forest land includes (a) transition zones, such as areas between forested and nonforested lands that are at least 10 percent stocked with forest trees, and forest areas adjacent to urban and built-up lands, (b) piñon-juniper and chaparral areas —note 2. the minimum area for classification of forest land is 1 acre (0.4 ha); roadside, streamside, and shelterbelt strips of trees must have a crown width of at least 120 ft (36.6 m); unimproved roads and trails, streams, and clearings in forest areas are classified as forest if less than 120 ft (36.6 m) wideThis definition last updated 08/11/2008