Northern Transbaikalia, border of the Patom and Stanovoy uplands. The highest ridges bordering the Stanovoye Highland from the north are Severo-Muysky and Kodarsky, with elevations up to 3072 meters above sea level. Here, on the right bank of Vitim, in the area of Lake Oron, the Vitim Nature Reserve was organized on May 20, 1982. The area of the reserve is 585,838 hectares. It is located in the southeast of the Bodaibinsky district of the Irkutsk region, where it borders the Republic of Buryatia and the Trans-Baikal Territory. Remote from transport routes, protected by high mountain ranges in the south and the impassable Vitim rapids, this site was preserved in a relatively pristine form during the period of rapid industrial development of the region and today represents the standard of nature of Northern Transbaikalia. Specially protected natural objects of the reserve are Lake Oron, the Kodar Glacier Region, bighorn sheep, black-capped marmot, and Barguzin sable.