A chum (pronounced "choom") is a temporary dwelling used by the nomadic Uralic (Nenets, Nganasans, Enets, Khanty, Mansi, Komi) reindeer herders of northwestern Siberia of Russia. The Evenks, Tungusic peoples, tribes, in Russia, Mongolia and China also use chums. They are also used by the southernmost reindeer herders, of the Todzha region of the Republic of Tyva and their cross-border relatives in northern Mongolia. It has a design similar to a Native American tipi but some versions are less vertical. It is very closely related to the Sami lavvu in construction, but is somewhat larger in size. Some chums can be up to thirty feet (ten meters) in diameter.