Later, it was enlarged to 113.42 square kilometres (43.79 sq mi) of which forests account for 96.14 km2 (3.68 km2 is designated as a strictly protected area), and water bodies cover 9.37 km2.

There are picturesque and deep valleys of the Drawa and Plociczna rivers as well as numerous water channels, lakes and peat-bogs.

One of main reasons for the creation of the park was the need for to protect valuable areas along the Drawa and Plocziczna rivers.

The Drawa creates interesting valleys and hollows and 40 km of the river is within the borders of the park.

The good quality of water in the lakes and rivers enables various species of fish to flourish.