East Manych (Russian: Восточный Маныч) is a river in the eastern and central part of the Kuma–Manych Depression in southern Russia.

The Kalaus River, when reaching the thalweg of the Kuma-Manych Depression at 45°43′N 44°06′E / 45.717°N 44.100°E / 45.717; 44.100, would split: the left distributary, flowing north and then west, toward Lake Manych-Gudilo, would become the source of the West Manych, while the right distributary, flowing south and then east, would become the headwaters of the East Manych.

At Kalaus, a rare phenomenon called "bifurcation" was observed, which refers to the division of the river into two branches directed to different water systems.

In order to maintain the level of the eastern compartment of the Proletarian reservoir, Kalaus was redirected to the Western Manych basin.

The reservoir is partially filled with local runoff from the Eastern Manych catchment area, as well as Terek and Kuma water supplied through the Terek-Manych waterway.