Based on the text provided:
- Russia is located in a big and diverse area, from grassy plains to snowy mountains and freezing cold Siberia.
- The text doesn't specify which countries border Russia in the South.
- The text doesn't specify what separates Europe from Asia in Russia.
- The text doesn't specify what the biggest river in Russia is.
- Landscapes found in Russia include grassy plains, snowy mountains, and freezing cold Siberia.