Within the Solec Basin, gypsum outcrops are common, forming rocky cliffs.

The karst forms found in Nadnidziański Park are unique in the country.

[1] The park protects an area of 231.64 square kilometres (89.44 sq mi) on the banks of the Nida River.

It was established in 1986, and is a Natura 2000 EU Special Protection Area.

Within the Landscape Park are ten nature reserves.