Smolensk (Смоленск in Russian) was an ancient city in Russia located 220 miles southwest of Moscow.
History and specifics[]
In the year 2273, Lieutenant Pavel Chekov, Hikaru Sulu, and Nyota Uhura planned to take a shuttle flight from the USS Enterprise to Smolensk. Sulu missed the trip, as he was summoned to San Francisco early for Demora Sulu's premature birth. Chekov and Uhura went without him, then took a subway from Smolensk to Podolsk, a 350-mile journey. (TOS eBook: Shadow of the Machine)