Leningrad is the alternate name used for the city of St. Petersburg, on Earth in the former nation-state of Russia.
In 2268 Pavel Chekov claimed that Scotch whisky had been invented by a "little old lady" from Leningrad. (TOS: "The Trouble with Tribbles")
Leningrad was hit by the effects of the Whale Probe in 2286, losing all electrical power, and experiencing a cloud cover of 100% - blocking out the sun, and causing temperatures to plummet. The damage was reversed following the actions of James T. Kirk and the "HMS Bounty". (Star Trek IV: The Voyage Home)
- The city was renamed St. Petersburg in 1991, four years after the movie was filmed - causing a real life retcon.
- Fandom sources place Pavel A. Chekov's birthplace as St. Peterburg.