Monument Rocks in Gove County, also known as the Chalk Pyramids, is for sale.

The formation, one of the “8 Wonders of Kansas” and a National Natural Landmark, is part of the 13,000 acre Pyramid Ranch being sold in a private phone auction by a Ulysses real estate firm. The sale also includes 12,000 acres of mineral rights.

The current land owner, the family-owned Thies Pyramid Corporation, has allowed public access to the Monument Rocks site for many years.