Mentor Marsh, designated as a National Natural Landmark in 1966, occupies an ancient abandoned channel of the Grand River. It was also the first site to be dedicated as a state nature preserve. A beech-sugar maple forest occupies the higher elevations bordering the marsh.

Mentor Marsh has been a National Park Service–designated National Natural Landmark since 1966 for being one of the most species-rich sites on the Great Lakes shoreline. In 1971, Mentor Marsh was dedicated as the first State Nature Preserve in Ohio.

Mentor Marsh is a body of water in Lake County, Ohio, United States. It is a lakeshore wetland with marsh vegetation, aquatic plants, swamp and bottomland forest, and upland forest. [1]

Mentor Marsh State Nature Preserve is located in Lake County, 3.5 miles west on SR 283 from Painesville. Visitors can enjoy hiking along the 4 mile trail system, including boardwalk trail while learning about nature and history at the Nature Center.

Mar 1, 2017 · Mentor Marsh State Nature Preserve occupies 646 acres and contains about four miles of trail; it was Ohio’s first state nature preserve. It is located in Lake County at Mentor, Ohio which is about forty miles east of Cleveland. The preserve is just …

Apr 30, 2025 · Mentor Marsh State Nature Preserve was Ohio’s first state nature preserve and the only remaining natural marsh along Ohio’s Lake Erie shore. It is being restored to remove invasive phragmites and return native marsh plants.

Mar 18, 2022 · Mentor Marsh is a local treasure with state- and nationwide impact. It is one of the largest natural marshes remaining along the Lake Erie shoreline, attracting huge numbers of migrating birds and breeding fish.

Mar 2, 2025 · Mentor Marsh, nestled in the heart of Lake County, Ohio, is a testament to the resilience of nature. This vast wetland, once a sprawling expanse of swampland, has weathered the storms of time, evolving into a vibrant ecosystem teeming with life.

Jul 24, 2019 · An abandoned Grand River channel, thousands of years old, the marsh was a rich, swamp forest ecosystem for hundreds of years. But in the 1960s, Osborne Concrete & Stone began dumping waste from the nearby Morton Salt Mine into …

Sep 15, 2019 · Mentor Marsh was Ohio’s first state nature preserve, dedicated in 1971. Kudos to the Cleveland Museum of Natural History for working to return it to its original splendor.