mountains
Mountains are not the signature feature of the Russian landscape, but if when we say "Russian" we have the entire empire in mind (as we almost always do at Imperiia)... it is a different story. Several remarkable ranges - wholly or in part - fell within the boundaries of the empire, including the Carpathians, the Caucasus, and the Eastern Range of Kamchatka (home to the highest volcanic peak in the northern hemisphere).
Charmingly (or comically, depending on your mood), the playing cards also make note of a number of... eh-hem... glorified hills. It won't take too much sleuthing to distinguish one kind of "mountainous" province from the other.
