Ladoga seal activities. The Ladoga seal is listed as an Appendix II species under the Bern Convention and also included in the Red Data Book of the Russian Federation. Ladoga seal The Ladoga ringed seal (; Pusa hispida ladogensis), is a freshwater subspecies of the ringed seal ("Pusa hispida") which are found entirely in Lake Ladoga in northwestern Russia. The subspecies evolved during the last ice age, about 11,000 years ago. As the glaciers retreated and water levels changed, the Baltic ringed seal (including Ladoga seals) was trapped in freshwater lakes and separated from the Arctic ringed seal. It is related to
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