Zaybaykalsky National Park (Russian: Забайкальский национальный парк) (in English, "Trans-Baikal") covers the middle section of the eastern shore of Lake Baikal, the west slope of the Barguzin mountains to the east, the Ushkany Islands, and the only large peninsula on the lake, Svyatoy Nos ("Holy Nose").

[1] Zaybaykalsky is bounded on the west by the shores of Lake Baikal, on the north by the Barguzin Nature Reserve (a strictly protected 'zapovednik' nature reserve of about the same size as Zaybaykalsky), and on the south and east by the Barguzin mountain range.

The island is known for its views of the lake (allowing a high central viewpoint to see mountains ranges across the water on all sides), and for its "singing sand" Marokov beach, so-called because of the sound made by walking on it.

The western shore of the lake sees the Academic ridge rise again above the water in the form of Olkhon Island, which is part of Pribaykalsky National Park.

The dominant vegetation formation is light coniferous taiga with Larix gmelini forming the canopy in areas with low snow cover.

Because of the sharp grades from the lake shore to mountain tops, the forests of Trans-Baikal display strong altitude zoning in the tree cover.

On a smaller scale, Bolshoy Ushinsky island is known for the greatest concentration of large anthills in Russia - thousands that rise up to 1.5 meters in height.

For the wide variety of hiking and recreational sites within the park, a day pass may be purchased at the entrance.