Fells are the mountaineous environments of Northern Finland and Lapland. Fell tops have no trees due to the cold and harsh climate conditions.

The high peaks of Lapland are at the mercy of strong winds and freezing cold. As trees do not thrive in these conditons, other organisms have even less protection from the harsh climate. Because of this, the plant life of fells has adapted by growing along the ground. The animals are also small, and take cover from the harsh environment by sheltering under the snow or in rocky holes.

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Halti is Finland's highest peak.

Fells also contain other kinds of vegetation zones. The lowest areas are covered in taiga forest. When one ascends a fell, the taiga forest gives way to white birch. At the tree line, white birch is replaced by the low-growing dwarf birch as the most common plant. In the north, the tree line is lower in elevation than in the south. 

The rock ptarmigan thrives on fell tops.