Where was the October revolution?
The October Revolution was part of the Russian Revolution - that started in Petrograd.
It occured on 25 October 1917 according to the Julian calendar, or 7 November 1917 according to the Gregorian calendar.
There were four Russian Revolutions. The first one was the Revolution of 1905. Then there was the February Revolution of 1917, then the more widely known one, the October Revolution, which is also named the Great October Socialist Revolution, Red October, October Uprising, or the Bolshevik Uprising. The latest was the 1991 Revolution, which ended the Soviet Union and formed the Russian Federation.