E-89, Овюрские плиты - the Ovur plates
Found in Sagly district along the Khachu-Khovu river in the Tuva Republic, Russia.
Located on the site.
A gray slate stone.
There are some old Turkic signs.
Grach found in 1957 for the first time. I.Batmanov, Chadamba, D.Vasiliyev provided researches.