The Eurasian mainland and Sakhalin Island are separated by the Strait of Tartary, with its largest island known as Moneron. Moneron is influenced by the Tsushima Current, so the water is not only transparent, but also very warm. Besides, the water area abounds with reefs: it is a real paradise for divers! This is not just Russia's first marine park: it is the only island nature park in the country.