Fells are the mountaineous environments of Northern Finland and Lapland. High-altitude Fells have no trees due to their 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. The plant life of fells has adapted to these conditions 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-altitude areas of fells are covered by taiga forest. When one climbs up 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.