Intact Forest Landscape - an intact forest landscape is a territory within the forest zone that contains forest and non-forest ecosystems minimally disturbed by human economic activity with an area of at least 500 km² and with a minimal width (diameter of the inscribed circle) of 10 km.

Forest Zone - the borders of the forest zone were defined according to the "Global Percent Tree Cover at a Spatial Resolution of 500 meters" map (Hansen et al., 2003). The forest zone includes all parts of the forests with a tree cover density of 20 percent or more (if the distance between them is less than two kilometers) and all non-forest plots which are fully surrounded by forests. All forest plots combined in this way were considered to be the part of the forest zone if their area was 500 km² or more.

Dense Forest - forest with a tree canopy cover density above 40 percent according to the "Global Percent Tree Cover at a Spatial Resolution of 500 meters" map (Hansen et al., 2003).

Open Forest - forest with a tree canopy cover density between 20 percent and 40 percent, according to the "Global Percent Tree Cover at a Spatial Resolution of 500 meters" map (Hansen et al., 2003).