Keystone Ancient Forest Preserve

The Keystone Ancient Forest Preserve is a 1,170 acre site about 15 miles from Tulsa, OK that was purchased by the Oklahoma Department of Transportation in order to prevent the land from being developed and protect its unique ecosystems. The land is home to a significant number of ancient red cedar trees as well as the world’s oldest known post oak tree, which are both estimated to be over 400 years old. The trees have assisted scientists in developing theories about climate changes during the past four centuries, and have also provided an educational opportunity to local communities and educational institutions.

The Preserve serves as a naturally beautiful setting for Highway 412, which sees 7 million travelers a year. The Nature Conservancy, which operates and maintains the site, was planning to build a visitors center and hiking trail as of 2002 to further attract visitors to the site.

The goal of the Keystone Forest Preserve is to preserve the land from being developed, protect its unique ecosystems, and serve as an outdoor space for visitors to enjoy and a beautiful setting for Highway 412.

To date, no studies have been completed quantifying the impact of the Preserve. Several educational institutions, including Oklahoma State University and the University of Arkansas, have benefited from the preserve as a "living classroom."