Kama, kah'ma, a river in Russia, rises in the northeaster part of the country and flows southerly and southwesterly and enters the Volga at Spask. Its length is about 1200 miles, and it is the longest tributary of the Volga. One of its tributaries is connected with a tributary of the Dvina by canal, so that it forms an important link in the waterways of the part of Russia through which it flows.