Some theories say that some early Eastern Slavs arrived in modern-day western Russia (also in Ukraine and Belarus) sometime during the middle of the first millennium AD. The Eastern Slavic tribe of the Vyatichis was native to the land around the Oka river. Finno-Ugric, Baltic and Turkic tribes were also present in the area (although large parts of the Turkic and Finno-Ugric people were absorbed by the Slavs, there are great minorities in European Russia today). The western region of Central Russia was inhabited by the Eastern Slavic tribe of the Severians.