The Site is a large mire complex with a number of large and smaller pools, as well as dry ground with open upland birch and Norway spruce (Picea abies) woodland. The mire complex is characterized by a variation of string mires (shifting dry and wet strings) and dryer mires on shallow slopes. Aquatic vegetation grows in slow-flowing rivers and streams and along pond edges. Hynna is an important area for breeding waterbirds such as the ruff (Philomachus pugnax), broad-billed sandpiper (Limicola falcinellus) and black-headed gull (Chroicocephalus ridibundus). The mire areas store carbon, regulate the local climate, provide water during droughts, and contribute to flood control during periods of high precipitation. Human uses are limited to leisure activities including sport fishing and hunting.