Ilek, Indigirka, Ingoda, Instruch, Iokanga, Irkut, Irtysh, Iset, Ishim, Istra, Izhora, Kama, Kamchatka, Kashinka, Kasplya, Katanga, Katun, Kazanka, Kerzhenets, Ket, Khatanga, Kheta, Khopyor, Kirenga, Klyazma, Kolva (Usa), Kolva (Vishera), Kolyma, Kondurcha, Kosovka, Kosovoy, Kostroma, Kotorosl, Kotuy, Krasnaya River, Kuban, Kubr, Kuma, Kunya, Laba, Lama, Lava/Łyna, Lena, Lovat, Lower Tunguska, Luga