Lake Seliger
Valdaysky National Park () is a national park in the north of Russia, located in Valdaysky, Okulovsky, and Demyansky Districts of Novgorod Oblast. It was established May 17, 1990. Since 2004, the National Park has the status of a UNESCO Biosphere Reserve. Valdaysky National Park, which includes the town of Valday, Lake Valdayskoye, and the northern part of Lake Seliger, is one of the most popular tourist destinations in Central Russia and has well-developed tourist infrastructure.