Erzi Nature Reserve (Russian: Эрзи заповедник) (also Erzee) is a Russian 'zapovednik' (strict nature reserve) located on the northern slope of the Greater Caucasus in the Dzheyrahsky Assinsky-basin, adjacent to the Skalisty Range (a chain of mid-height mountains that runs parallel to the main ridge of the Caucasus, but just to the north).

The northern third of the territory is forested, the ridge area is alpine meadows and mountain steppe.

This climate is characterised by long cold winters, and short, cool summers.

Summer rains tend to be heavy and violent, due to rising thermal air current.

Underbrush at the mid-level include sea buckthorn (Hippophae), willow, gray alder, and in places extensive hazel.

Accommodations are available in buffer zones outside the park, and some excursions have daily bus service to the trail heads.