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
Lake Glubokoye (Karelian Isthmus) Lake Glubokoye (Karelian Isthmus) Lake Glubokoye (, lit. "Deep Lake"; ) is a lake on Karelian Isthmus, in Vyborgsky District of Leningrad Oblast. The nearby larger settlements are Kirillovskoye (18 km) and Baryshevo (38 km). The area of the lake is , and the area of its drainage basin is . The lake is connected by an unnamed channel with Lake Bolshoye Rakovoye, located several kilometers northeast. In its turn, Lake Bolshoye Rakovoye is the source of the Bulatnaya River, which flows into the southern branch of the Vuoksi River. The whole system belongs to the basin of Lake Ladoga