An area of wet grassland and alkaline fen with associated sand islands, the former being extensively grazed by cattle. One sand island in the Nauener Luch holds 28 ha of sewage-sludge ponds.
The site holds more than 20,000 passage waterbirds, on a regular basis, and is also a major migratory bottleneck site, where up to 32,000 Grus grus regularly pass. Species of global conservation concern that do not meet IBA criteria: Crex crex (4-6 breeding pairs) and Otis tarda (resident).
BirdLife International (2019) Important Bird Areas factsheet: Oberes Rhinluch / Havelländisches Luch Nauen-Friesack. Downloaded from http://www.birdlife.org on 13/12/2019.