Ömnögovi Province in the context of "Tumed"

The Tümed (Mongolian: Түмэд; Chinese: 土默特部; "The many or ten thousands" derived from Tumen) are a Mongol subgroup. They live in Tumed Left Banner, district of Hohhot and Tumed Right Banner, district of Baotou in China. Most engage in sedentary agriculture, living in mixed communities in the suburbs of Hohhot. Parts of them live along Chaoyang, Liaoning. There are the Tumeds in the soums of Mandal-Ovoo, Bulgan, Tsogt-Ovoo, Tsogttsetsii, Manlai, Khurmen, Bayandalai and Sevrei of Ömnögovi Aimag, Mongolia.

From the beginning of the 9th century to the beginning of the 13th century, the Khori-Tumed [ru] lived near the western side of Lake Baikal. They lived in what is now southern Irkutsk Oblast, in some parts of Tuva and in southwestern Buryatia. In 1207, Genghis Khan, after conquering the Khori-Tumed, decided to move some of these groups south and these people eventually settled in the southern parts of the Great Gobi Desert. But it seems that the Tumed people had no strong connection with those forest people in Siberia.

The Ongi River (Mongolian: Онги гол, Chinese: 翁金河, 翁金高勒) flows from the southeastern slopes of the Khangai Mountains in Övörkhangai Province for 435 kilometres or 270 miles through the endorheic Ongi River Basin in Mongolia and through the aimag capital Arvaikheer. In some particularly wet years, it used to empty into Ulaan Lake in north central Ömnögovi Province, in most years it dries up earlier.

In recent years it has been additionally threatened by 37 mining operations within the basin, but successful pressure by Tsetsgeegiin Mönkhbayar and the Ongi River Basin Movement helped convince 35 of the operations to cease explorations and harmful activities in the region. The water and groundwater in this area may be contaminated with mercury and cyanide from the mining industry.