The lake "Dümmer" is a 16 km² big lake and is with a average depth of 1,5 m very shallow. This makes the lake itself a very good habitat for all kinds of resting waterfowl, with thousands of geese and ducks. On areas of waterlilies Black Tern can breed. The reedbeds around the lake are breeding habitat for e.g. Marsh Harrier, Great Bittern and Savi's Warbler and following willow shrubs for Bluethroat and Common Nightingale. After the last Ice Age the lake was much bigger, but mires grew around it and provide beautiful meadows today. They inhabit one of the last big populations of breeding Black-tailed Godwit, Snipe, Eurasian Curlew, Corn Crake and Northern Lapwing, by a very well water management on meadows. About one of the last breeding pairs of Ruff in Germany is speculated here nearly every year.
As the area is really big, there are several options. The best options is given by the brochure "Vögel beobachten im Naturpark Dümmer" (english: "Birdwatching in Nature park Dümmer") you can download the detailed (German) pdf with maps and routes at the Website of the "Naturrschutzring Dümmer". See the links below.