The site was formerly a clearing pond for an iron-ore company. The water is brackish.
This is an important area for waterbirds and species breeding in reedbeds (Phragmites). Species of global conservation concern that do not meet IBA criteria: Crex crex (passage).
BirdLife International (2020) Important Bird Areas factsheet: Heerter See. Downloaded from http://www.birdlife.org on 09/04/2020.