Uncover the natural diversity of Middlefork Savanna Forest Preserve, spanning 687 acres in Lake Forest, Illinois. This rich landscape includes oak savannas, prairies, marshes, woodlands, and a section of the North Branch of the Chicago River. Notably, it hosts 25 acres of the "highest quality tallgrass savanna," a globally endangered ecosystem. Managed by Lake County Forest Preserves, the preserve invites exploration with 5.5 miles of gravel trails for hiking, running, and cross-country skiing, as well as 4.2 miles of biking trails.