Location and Land Formation
Area of the refuge covers 86300.3 ha. It is located in Inskie Lakeland. The place has a very diverse lay of the land and large differences in relative heights. There are elevations of a frontal moraine, sandurs and plateaus of a bottom moraine. Ostoja Inska is dominated by Glowacz Mountain(180 m. a.s.l.). The described area is drained mainly by the Ina river and its north part by the Rega river. A characteristic feature of the local landscape is rugged land, scattered forests, little reservoirs and marshes. The biggest reservoir is the Ina Lake with the area of 6 km² and maximum depth of 42 m.

Flora
A significant part of the area is covered by agriculturally exploited lands. In the second place one should mention strongly scattered forests - dominated by fresh stands with beech and oak as well as mixed forests. A large percentage is represented by wet and marshy forests with alder, ash, pine and birch. Meadow communities, sedge communities, reed communities and peat bogs cover a little part of the refuge. So far presence of almost 20 species of protected plants have been recorded here. There occurs floating water plantain among plants listed in Appendix II of the Habitat Directive.

Fauna
The biggest value of Ostoja Inska is its avifauna, i.e. birds, which nest here in number of almost 150 species. Populations significant in country scale are formed here by cranes, common teals, gadwalls, common goldeneyes, common mergansers and bitterns. A range of birds of prey looks very impressive. White-tailed eagles, which gather here in loose flocks up to 35 specimens, is strongly represented throughout a whole year, including winter and migrations. In the air it is often accompanied by both kites, lesser spotted eagles and marsh harriers. During migrations large concentrations are formed by cranes (up to 2 thousand specimens), whooper swans and shorebirds.

Among animals listed in appendixes of European directives you can meet here:

• mammals: beaver, wolf, otter;
• birds: ortolan bunting, red-backed shrike, red-breasted flycatcher, barred warbler, wood lark, middle spotted woodpecker, kingfisher, nightjar, eagle-owl, common tern, whiskered tern, , black tern, ruff, corn crake, spotted crake, crane, marsh harrier, black kite, red kite, honey-buzzard, white-tailed eagle, lesser spotted eagle, mute swan, black stork, white stork and bittern;
• amphibians: great crested newt, fire-bellied toad;
• fish: bullhead and brook lamprey.

Protection
Within Ostoja Inska the following forms of protection have been applied:

• nature reserves - Glowach, Jezioro Dlugie Inskie, Kamienna Buczyna, Wyspa Soltysi;
• the Ina Landscape Park;
• the Area Of Protected Landscape "D" (Choszczno-Drawsko) Mialka;
• ecological lands - Bagno Ciszewo, Dluskie Wzgorza, Plaskowyz nad Samotnikiem, Wierzchucice, Wilkowe Bagno and Ostrowie Natural-Landscape Complex.