Lake Baikal did not belong to China in the Qing Dynasty. The Qing Dynasty controlled the area for a short time. After the Treaty of Nebuchadnezzar, it was ceded to Tsarist Russia.
China ancient books in Baikal Lake are called Beihai, Baihai, Xiaohai, Juhai, Yunibei, Baihaier Lake and Baihar Lake. China's ancient history books clearly recorded the Baikal area as the biography of Han Su Wu. China, known as Beihai in ancient times, was once the main activity area of northern tribes in China, and Lake Baikal is the inhabited area of Irkutsk ethnic minorities, among which Buryat, a branch of Mongolian, has a large population.
Lake Baikal was called Beihai in the Western Han Dynasty and was controlled by Xiongnu. In the Eastern Han Dynasty, the Three Kingdoms and the Western Jin Dynasty, it was said that Beihai was controlled by Xianbei. It was called Sini Dashui in the Sixteen Kingdoms Period of the Eastern Jin Dynasty. In the Southern and Northern Dynasties, it was called Sini Dashui, which was first controlled by Rouran and then by Turkic. During the Sui Dynasty, it was said that the North Sea was controlled by East Turkistan. During the Tang Dynasty, it was said that Xiaohai was controlled by the Tang Dynasty's Daogu Ligan.
At the end of the Tang Dynasty, it was called Xiaohai, which returned to the control of Turks, and then came under the jurisdiction of Uighurs. In the Song Dynasty, it was said that Xiaohai was controlled by the Mongolian Ba La Hu Department. In Dayuan Empire, it was called Xiaohai, belonging to "Lingbei Province". In the Ming Dynasty, Xiaohai was said to be under the control of the dental department of Walabuli. In the early Qing Dynasty, Lake Baihar and Beihai were controlled by Russia. In the late Qing Dynasty, Baihaier Lake was controlled by Russia.
Extended information:
"Lake Baikal" is a transliteration of the English word "baykal", and it is called "baukaji" in Russian, which comes from Mongolian and is transformed from "saii" and "kyji", meaning
Baikal is called "la mi u" in Ewenki language, which means "sea"; Mongolian and Buryatian are called "baigal dalai", which means "natural sea"; Yakutia is called "baikel", which means "rich lake". Anthropologists believe that the present "baikal" comes from Buryatian.
The meaning of Lake Baikal, the explanation of the Map Edition of World Cultural and Natural Heritage Scenes is "rich lake"; "World Cultural and Natural Heritage in Color Map Edition" holds that the local Buryats call it "Baikal-Dalay", which means "the sea of nature"; However, the text of "Exploring the Wonders of the World" is: The name "Baikal" is said to have been given by the Kulikan people who lived here about 13 years ago, meaning "a lot of water".
Baidu Encyclopedia-Lake Baikal