Heads at the SE end of Summit Lake at 630625N, 1452945W, flows S to the Copper River, 9 mi NE of Glennallen. 60 miles long.
Indian name reported by Oscar Rohn in 1899 as "Kulkana." Captain W. R. Abercrombie, USA, changed Rohn's spelling to its present form. Lieutenant H. T. Allen, USA, reported "Tonkina" as the streams Indian name in 1885.