The Lena (, ; ; Buryat: Зүлхэ, Zülkhe; , Ölüöne) is the easternmost of the three great Siberian rivers that flow into the Arctic Ocean (the other two being the Ob and the Yenisei). It is the 11th longest river in the world and has the 9th largest watershed. It is also the 3rd largest river in Asia. It is the largest among the rivers whose watershed is entirely within the Russian territorial boundaries.