The distribution of all these is, however, very unequal, and the five following subdivisions may be established: - (T) the tundras; (2) the forest region; (3) the middle region, comprising the surface available for agriculture and partly covered with forests; (4) the black-earth (chernozyom) region; and (5) the steppes.
The Arctic Region comprises the tundras of the Arctic littoral beyond the N.
The Forest Region of the Russian botanists includes the greater part of the country, from the Arctic tundras to the steppes, and over this immense expanse it maintains a remarkable uniformity of character.
European plains - the tundras, including the Arctic islands, the forest region, especially the coniferous part of it, and the ante-steppe and steppes of the black earth region.
In the region of the tundras life has to contend with such unfavourable conditions that it cannot be abundant.