Thank you all! I guess, only by ferry down the Obi river
..so, we have to change the route. Basically , the ideea was to try some real adventurous route from the Ural mountains to lake Baikal, really off the highway, getting a taste of the real siberian wilderness. That's why I imagined a road through Khanty-Masinsk, Surgut, Obi river to Yenisey river- Yeniseysk town. But I guess that's not doable... so, we would appreciate ideas for other itineraries in the region (they should be not loger than 8 days!!!!)
Thank you again!