The Tamma is a right
tributary of the Lena. It is formed on the Sellyakait-Sella Ridge (Кряж Селлякаит-Селля), at the confluence of the Konyo-Daban and Ilin-Daban rivers in the
Lena Plateau, between the Lena and the
Amga. It heads in a roughly northwestern direction parallel to the
Menda in its upper and middle course. It flows mostly across Megino-Kangalassky District but in one stretch it forms the border between this district and
Khangalassky District. There are a few small lakes in the lower course of the river, part of the neighboring Lena
floodplain. Finally it meets the Khaptagay arm of the Lena from its source near the village of
Khaptagay, south of
Yakutsk. The largest tributary of the Tamma is the long Khompu from the right. The river freezes between October and May. ==See also==