We officially exited the Russian administrative border of Siberia a couple hours before arriving in Yekaterinburg, and we'll be crossing the geographic boundry of Asia minutes after we depart this city. Russia spans a huge chunk of two continents while truly belonging to neither.
The culture of these cities hasn't been as different from Moscow as I expected. It seems that from 19th century exiles, to the coming of the Trans-Siberian railroad at the turn of the century, to Soviet industrializarion east of the Urals from 1930-1965, through more recent natural resource extraction, the area is pretty well Russified. While there is some presence of the native peoples and of Asian businesses & visitors, it is not that striking.
Siberia has been quite green with grasses & trees and colored by wildflowers. While we've seen some areas of particularly marshy taiga, it is generally not obvious how extensive the permafrost is that makes this just a silly place to try to grow crops or build a railroad.