The Kott language is an extinct Yeniseian language

Yeniseian languages

The Yeniseian language family is spoken in central Siberia.-Family division:0. Proto-Yeniseian...

 that was formerly spoken in central Siberia

Siberia

Siberia is an extensive region constituting almost all of Northern Asia. Comprising the central and eastern portion of the Russian Federation, it was part of the Soviet Union from its beginning, as its predecessor states, the Tsardom of Russia and the Russian Empire, conquered it during the 16th...

 by the banks of Mana River

Mana River

Mana is a river in the Krasnoyarsk Krai making a confluence with the Yenisey River in 16 km from the Krasnoyarsk city. It is the second largest river in the Krasnoyarsk neighborhood after Yenisey....

, a tributary of the Yenisei river

Yenisei River

Yenisei , also written as Yenisey, is the largest river system flowing to the Arctic Ocean. It is the central of the three great Siberian rivers that flow into the Arctic Ocean...

. It became extinct in the 1850s. Some linguists believe the Assan language

Assan language

Assan was a Yeniseian language which became extinct in the 19th century. It was closely related to the Kott language.-External links:*...

 was a dialect of Kott. Kott was closely related to Ket

Ket language

The Ket language, formerly known as Yenisei Ostyak, is a Siberian language long thought to be an isolate, the sole surviving language of a Yeniseian language family...

, still spoken farther north along the Yenisei river.

In 1858, Matthias Castrén

Matthias Castrén

Matthias Alexander Castrén was a Finnish ethnologist and philologist.Castrén was born at Tervola, in Northern Finland, on the 20th of November...

published the grammar and dictionary (Versuch einer jenissei-ostjakischen und kottischen Sprachlehre), which included material on the Kott and Ket (Yenisei-Ostyak) languages.