At Kungsbro there are extensive pastures that contribute to a varied landscape. The bird-rich water meadows and pastures with their large oaks, meadowland flora and thickets rich in birds contribute to a very valuable environment.
The conditions are also right for a flora and fauna rich in species. Well-managed water meadows are a rare phenomenon in the province as well as in Sweden as a whole.
Grasses and sedges dominate the vegetation in the water meadows. Tussock Grass and Creeping Bent are most common in the dryer areas and there are also plants such as Bog Violet, Meadow Sweet, Ragged Robin, Forget-me-not and Silverweed. This is also where the rare Fen Violet is to be found.
Where the water meadows are regularly flooded the vegetation is taller and dominated by Lesser Pond Sedge and Tufted Sedge with a fair proportion of Purple Small-reed. Reed Sweet Grass, Reed Canary Grass and Great Water Dock are to be found here and there. South of the river, Motala Ström, the terrain has a richer flora that includes Reed Sweet Grass, Creeping Bent, Creeping Brown Sedge, Pale Sedge, Common Spike-rush and Marsh Cinquefoil. In the southern part there is an Alder carr with patches of Sallow.
In the northern section of the reserve there is a fine oak pasture called Torparhagen. Among the trees the large oaks dominate, but there is also Alder alongside a stream. Considerable thickets of Sloe and Brier are to be seen here and there. The fairly dense grass has a meadow and pasture type of flora with plants such as Quaking Grass, Crested Dog's Tail, Brown Knapweed, Dropwort, Yellow Rattle, Crested Cow-wheat, Viper's Grass, Heath Spotted Orchid, Globeflower, Common Rockrose, Ragged Robin, Lesser Butterfly Orchid and Hoary Plantain.
The area has a rich insect fauna and on the old oaks there are several red-listed (threatened) species of lichens.
The bird life of Kungsbro is also abundant and varied. Waders such as Snipe and Lapwing nest on the water meadows, along with Meadow Pipit and Yellow Wagtail. These meadows are also an important feeding place for migrating waders in the spring and autumn. The reed beds provide nesting areas for birds such as the Great Reed warbler, Greylag Goose, Marsh Harrier and Bittern. In the thickets you can see Penduline Tits, Grasshopper and Marsh Warblers and in the oak pasture species such as Red-backed Shrike and Scarlet Rose Finch build their nests.
The reserve has several ancient monuments that are protected by law. These include an Iron Age burial site with several stone circles in an area of 110 x 30 m in the oak pasture. There are also some stone mounds left by traditional agriculture.
The total area of the reserve extends to 100 hectares, which includes 57 hectares of land. The reserve is owned by the State. During the nesting season, 1 April - 30 June, access is limited to the marked paths.