Answer : 4. "North Siberia"
Explanation :

1. Habitat of the Yakut tribe in Northern Siberia.

2. The Yakuts, or Sakha, are a Turkic ethnic group that lives primarily in the Sakha Republic in the Russian Federation. Their habitat also extends to the Amur, Magadan, Sakhalin regions and the Taimyr and Evenk districts of the Krasnoyarsk Territory.

3. Yakut language belongs to the Siberian branch of Turkic languages. The Russian word Yakut is derived from Evenk Yoko.

4. In some old histories the Yakuts call themselves Sakha or Urangai Sakha.

5. The Yakuts engage in animal husbandry, traditionally focusing on the raising of horses.