Inseln im Großen Plöner See und Halbinsel Störland, Protected natural area near Plön, Germany

The islands within Lake Plön and Störland Peninsula form a protected natural area covering about 261 hectares, featuring open water, reed beds, and several uninhabited islands. The water zones vary in depth, creating distinct habitats across the reserve.

The reserve was designated by ordinance on 25 November 1992 and entered as number 103 in Schleswig-Holstein's register of nature reserves. It forms part of the FFH area "Seen des mittleren Schwentinesystems und Umgebung" and of the EU bird protection area "Großer Plöner See-Gebiet". The Naturschutzbund Deutschland's Schleswig-Holstein branch oversees the site.

The reserve is tended by volunteers of the Naturschutzbund Deutschland, Schleswig-Holstein branch, and grazed by Galloway cattle on the wet grassland of the Störland peninsula and the Seebrook. The grazing keeps the meadows open, and the hedges dividing them shelter red-backed shrikes and nightingales. Drainage was stopped so natural hollows hold water again.

A Redder, a hedged country lane, runs along part of the reserve's southern edge; from there parts of the protected area can be viewed without leaving the path. The peninsula Störland and the Seebrook lie in the south of the reserve, where wet grassland is grazed by Galloway cattle. The reserve is looked after by the Schleswig-Holstein branch of NABU.

The reserve's seven islands — Alswarder, Konau, Ziegen Warder, Sack, Triebs, Langes Warder and Rotten Warder — lie in the shallow central water zone of the Großer Plöner See. Tree cavities on them give goldeneye and goosander nesting sites, and a white-tailed eagle also breeds here. In late summer, large flocks of ducks, geese and divers gather in these shallows to moult.