The Kostroma (Russian: Кострома́) is a river in the European part of Russia.

[1] The average water flow is 71 cubic metres per second (2,500 cu ft/s) at the town of Buy, 124 kilometres (77 mi) from the mouth,[2] and 85 cubic metres per second (3,000 cu ft/s) at the mouth Major tributaries include the Vocha, Mezenda, Vyoksa, Tyobza, and Shacha on the left, and the Shugoma, Svetitsa, Selma, Monza, and Obnora on the right.

[citation needed] In the upper and middle reaches of the riverbed there are rapids, and the banks are often wooded and sometimes steep.

Here it is suitable for swimming due to the large amount of snags and debris.

From here down to the reservoir it begins to form large bends and oxbow lakes, and sometimes floods.