The Khopyor (, also transliterated as Khoper) is a river in European Russia, the biggest left tributary of the river Don. It is 979 km long, with a watershed of 61100 km2. The mouth width is 300 m. The Khopyor is navigable up to 323 km from the mouth. The maximum discharge is 3720 m3/s; the average discharge is 150 m3/s, and the minimum discharge is 45 m3/s. Fish in the river include bream, zander, common roach, rudd, European chub, ide, bleak, catfish, pike, perch, asp and burbot. Found near the river elks, hares, herons, swans, eagles, falcons, owls, nightingales, ducks, beavers, pond turtles, snakes (vipers), etc. Previously, there were bison, now exterminated. The unique nature made Khopyor a favorite place for tourists.

Tributaries

The largest tributaries of the Khopyor are, from source to mouth:

Towns

Towns on the Khopyor River in orographic sequence (from source to mouth) are: Downstream from Borisoglebsk, is the Khopyor Nature Reserve, populated with protected beavers, wisents and Russian desman. It also has various protected flora including Iris tenuifloia.

Cultural associations

In 1834, Mikhail Zagoskin published a collection of ghost stories entitled An Evening on the Khoper River. According to legend, an oldman Hopper lived in these places of Penza Oblast. One day he went by steppe and saw 12 springs. The old man took a shovel and assembled all the springs in one big stream. On this stream oldman Hopper built a mill to grind grain for the peasants from nearby villages. Later the river was given the name of its creator. The river gave its name to the Khoper-Invest company, infamous for its pyramid scheme fraud.