Gloydius halys

Gloydius halys, the Siberian or Halys pit viper, has a wide range that stretches from east of the Urals in Russia across Central Asia and Mongolia to China. The largest recorded female measured 59 cm in total length and the largest male 53 cm. (The Reptile Database; Wikipedia, general species account)

It is moderately stout with a slightly upturned snout. The back is grey, pale brown, reddish or yellowish with large dark spots or crossbars that have serrated edges, and a wide dark stripe runs behind the eye. The belly is whitish, speckled with grey or brown. (Wikipedia, general species account)