Kronstadt , also spelled Kronshtadt, Cronstadt ( for "crown" and Stadt for "city"; , ), is a municipal town in Kronshtadtsky District of the federal city of St. Petersburg, Russia, located on Kotlin Island, west of St. Petersburg proper near the head of the Gulf of Finland. Population:
It is also St. Petersburg's main seaport. In March 1921, it was the site of the Kronstadt rebellion.