Ket River (Russian: Кеть), also known in its upper reaches as the Big Ket River (Russian: Большая Кеть) is an east-flowing river in the Krasnoyarsk Krai and Tomsk Oblast in Russia, a right tributary of the Ob River. The Ket River is 1,621 kilometres (1,007 mi) long. The area of its basin is 94,200 square kilometres (36,400 sq mi). It freezes up in late October or early November and stays under the ice until late April or early May. Its main tributaries are the Sochur, Orlovka, Lisitsa, Little Ket, Mendel, Yelovaya, and Chachamga.
A fort was established at Ketsk in 1602 and at Makovsk on the upper Ket in 1618. Makovsk was also called Makarskoi Fort or Makovskaya Pristan (=landing). The portage east to Yeniseysk, one of the longest portages in Siberia, was called the Makarskoi Portage. In the late 19th century, the Ket-Kas Canal was built to connect the Ket with the Greater Kas River that flows into the Yenisei. This project would make the Ket a part of the waterway connecting the Ob River basin with the Yenisei. Unfortunately, being shallow, long, inconveniently located, and frozen the greater part of the year, the canal was not competitive with the Trans-Siberian Railway, and was abandoned around 1921.
- Clifford M Foust,'Muscovite and Mandarin', 1968, page 100