The Shlisselburg Fortress or Oreshek Fortress (Russian: Крепость Орешек) is one of a series of fortifications built in Oreshek (now known as Shlisselburg) on Orekhovy Island in Lake Ladoga, near the modern city of Saint Petersburg in Russia. The first fortress was built in 1323. It was the scene of many conflicts between Russia and Sweden and changed hands between the two empires. During World War II, it was heavily damaged. Today it is part of the UNESCO World Heritage site Historic Centre of Saint Petersburg and Related Groups of Monuments.
