Later the Pomor discovered and maintained the Northern Sea Route between Arkhangelsk and Siberia. With their ships (koches), the Pomors penetrated to the trans-Ural areas of Northern Siberia, where they founded the settlement of Mangazeya east of the Yamal Peninsula in the early 16th century. Tatyana Bratkova has reported that some historians speculate that in the early 17th century, Pomors settled the isolated village of Russkoye Ustye in the delta of the Indigirka, in north-eastern Yakutia.[1]