Onufriy Stepanov (Russian: Онуфрий Степанов) (died June 30, 1658) was a Siberian Cossack and explorer of the Amur River. For background see Russian–Manchu border conflicts. 1653: After Yerofey Khabarov’s arrest and departure to Moscow in the fall of 1653, Onufriy Stepanov was appointed his deputy in the region of Dauria (upper reaches of the Amur River) and put in charge of the 320 men who remained there. Stepanov and his men suffered privations without enough grain and timber, so they decided to sail down the Amur River beyond the Sungari River to the Ducher country in order to procure food and building materials. Stepanov succeeded in his mission, but not without skirmishes with the Duchers, exacting a considerable yasak from them. Here he built winter quarters.