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.

[3] The shores are low and gentle, overgrown with grassy vegetation and bushes in places, interspersed with sandy stretches.

The southwestern, western and northern shores are overgrown with sedges, Glyceria, Scolochloa and Phalaris forming dense thickets, with Beckmannia and grass rush, among others, in certain areas.

The aquatic plant Elodea canadensis entered the lake over a decade ago and has become an invasive species, much like in neighboring Bolshoy Yeravna.

Among the other benthic fauna nematodes, oligochaetes, leeches, mollusks, water mites, as well as the larvae of biting midges, chironomids and dragonflies deserve mention.