 Part of <unk> Forest is preserved within the city limits by two nature reserves — a total area of 105 ha ( 260 acres ) . The <unk> Forest Nature Reserve ( Polish : <unk> <unk> Las <unk> ) , which is contained within the city limits , is a fragment , 33 @.@ 48 ha ( 82 @.@ 7 acres ) , of the riparian forest with a dominant assemblage of oak and hornbeam . The <unk> Nature Reserve ( Polish : <unk> <unk> <unk> ) is a 70 @.@ 07 ha ( 173 @.@ 1 acres ) park in the city that preserves the natural state of a forest fragment characteristic of the Białystok Upland , with a dominant mixed forest of hazel and spruce . 
