Answer: yenisei

AnswerCrossword Clue
YENISEIRiver in E. Siberia, 2,950 mi. to Arctic.
YENISEIDudinka is on this 2,800-mi. river.
YENISEIRiver in Siberia, 2,950 miles long.
YENISEI2,800-mile river in Siberia.
YENISEI2.364-mi. river in Siberia.
YENISEILong Siberian river.
YENISEIRiver into the Kara Sea