kierma for rare and threatened Finnish Forest Reindeer fawn, and/or old Eastern Finnish word kiermi for type of fishing net drying stand) is a medium-sized lake in the Vuoksi main catchment area.

It is the country's 53rd largest lake with an area of 85.57 square kilometres (33.04 sq mi)[1] and consists of a wide open lake with plenty of islands in both northwest and southeast parts of it and several long, narrow bays in both ends.

The northwest–southeast form shows the orientation of the moving Glacier in the latest Ice Age.

Heinävesi parish village is located on the southern shore of the lake.

A big part of the lake is protected in Natura 2000 conservation program (code FI0500011).