Leningrad Oblast of two great lakes of the European Part of Russia, Lake Ladoga and Lake Onega. Its northeastern part, between the Gulf of Finland and Lake Ladoga, occupies the Karelian Isthmus. Some islands in the Gulf of Finland (including Kotlin, on which the city of Kronstadt has been built) and Lake Ladoga (including Konevets) also belong to the oblast. Much of the area of the oblast belongs to the drainage basin of the Neva, which is the only outflow of Lake Ladoga. Whereas the Neva, which flows to the Gulf of Finland (the city of Saint Petersburg is located in its
Staraya Ladoga the town's military significance also decreased. Ladoga belonged to the Vodskaya pyatina of the Republic and contained eighty-four homesteads in the 15th century; most of the land belonged to the church. The Novgorodians built there a citadel with five towers and several churches. The reconstruction of one of the towers of Staraya Ladoga's fortress was scheduled to be completed in 2010. The heart of Staraya Ladoga is an old fortress where the Yelena River flows into the Volkhov. In earlier times, it was a strategic site because it was the only possible harbor for sea-vessels that could not navigate through