Maly Yeravna (Little Yeravna) is part of the
Yeravna-Khorga Lake System (), which includes 6 large lakes and a number of smaller ones. It is located at the southwestern end of the lake group, together with
Bolshoy Yeravna to the west, separated from it by a narrow
landspit.
Lake Sosnovo lies further to the southwest and small Lake
Khaimisanov to the south. The lake is shallow, with an average depth not reaching . The Maly Yeravna has a catchment area made up of
forest steppe. Maly Yeravna is fed by two rivers, the Domnaya, flowing from the southeast, and one of the branches of the Tuldun which enters the lake in the northwest. In dry years the lake dries almost completely, but when the water levels are high the Yeravna lakes are connected with each other by intermittent channels. The outlet is via the Khorga lakes to the northeast through the
Kholoy, a small, shallow tributary of the
Vitim River flowing from
Isinga lake at the northeastern end. The lake is fed by snow and rain, but since it lies in an area of variable moisture, it can have significant fluctuations in the water level from year to year. ==Flora and fauna ==