The Saimaa Canal is inaugurated.

The Saimaa Canal is a transportation canal that connects lake Saimaa with the Gulf of Finland near Vyborg, Russia. The canal was built from 1845 to 1856 and opened on 7 September [O.S. 26 August] 1856. It was overhauled and widened in 1963–1968.

September 7 is the 250th day of the year in the Gregorian calendar; 115 days remain until the end of the year.