An area is 400 ha. The administration of the Gumista reserve is shared between Pskhu and Skurchi Reserves. The climate is marine humid. The average annual temperature is 9.1 degrees, January -1.6, August 23.4, average precipitation 2284 mm. The landscape is of mountain-meadow type.
Upper border coincides with the subalpine forest boundary.
Major orographic unit is the Bzipi range. There are no industrial pollution sources along the river. There are 484 plant species growing in the reserve, more then 50 of them are endemic. Consequently the maintaining protection regime for the reserve is complicated.