Russia has a mostly continental climate, which means very cold winters and warm summers. However, because Russia is so large, there are several different climate zones. The Arctic zone in the north is very cold all year and covered by tundra – a frozen, treeless plain. The subarctic zone in Siberia has extremely cold winters(below -40°C) and short summers, with much of the ground covered by permafrost. The temperate zone, where most of the population lives, has warm summers (+20– 30°C) and cold, snowy winters. Finally, the steppe zone in the southwest is flat and grassy, with hot, dry summers and cold winters – this is Russia’s main agricultural region. In terms of the natural environment, Russia is very diverse. It has the world’s largest forest, the taiga (a huge boreal forest of pines and firs), which covers much of Siberia. Russia also has thousands of rivers (the Volga, Lena, Yenisei) and the deepest lake in the world, Lake Baikal, which contains about 20% of the world’s unfrozen