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 Otradnoye Lake Otradnoye Lake Otradnoye (; ) is a lake on Karelian Isthmus, in Priozersky District of Leningrad Oblast, south of the town of Priozersk. The area of the lake is , and the area of its drainage basin is . The lake is the source of the Pionerka River (Pyhäjöki River) which flows to the west and drains into Lake Komsomolskoye. In its turn, Lake Komsomolskoye drains into Vesyolaya River, a tributary of the Vuoksi River. Whereas the lake belongs to the basin of Lake Ladoga which is located about to the east, its outflow runs to the west. The