Cornplanter State Forest is a Pennsylvania state forest in northwestern Pennsylvania, named for Chief Cornplanter of the Seneca Nation and spread across Crawford, Forest, and Warren counties. Though only 1,585 acres, it reflects the larger history of Pennsylvania’s state forest system, which grew after old-growth forests were heavily cut by lumber and iron companies and repeated wildfires scarred the land. Conservationists, especially Dr. Joseph Rothrock, pushed for active forest management, leading to state land purchases beginning in the late 1890s. The forest also includes Anders Run Natural Area, where surviving old-growth woodland preserves part of the region’s earlier landscape.