Norway, Sweden, and Finland comprise what is known as Fennoscandian tundra. Large areas of the Fennoscandian tundra are mountainous and the tundra is completely void of trees. Vegetation within this ecotype has been studied extensively for almost 300 years, the first known plant expedition being that of Rudbeck to the Swedish Lappland in 1720. Vegetation is diverse with a range of grass, shrub, forb, lichen and heath species comprising various compositions. Wild reindeer inhabited the tundra region for thousands of years, but they are now extinct from both Sweden and Finland with a remnant population persisting in the mountains of southern Norway.