Situated on the right bank of the Narew river, among Kalinowo and Drozdowo villages, 5 km to the east from Łomża. It occupies 69,76 hectares of land. The preserve constitutes the fragment of the multispecific forest about the natural character. Is an only fragment of the natural forest on all Wysoczyźnie Kolneńskiej. One can see: lilia złotogłów, naparstnica zwyczajna, zawilec wielokwiatowy, gnieźnik leśny or podkolan biały. A very important thing is the support of the dynamic process of regenerating the structure of vegetation patches similar to natural.