hi, thanks to all of you. r.fill.dir worked fine for finding all depression areas! after a simple mapcalc and r.null command i got a final map showing all the depression areas. Thanks Greetings Johannes -- -- Johannes Buehler __O Feldtstr. 45 =`\<, 14789 Greifswald (=)/(=) johannesbuehler at oderbruecke.de -----------