|Glen Helen Nature Preserve|
|Location||Greene County, Ohio|
|Nearest city||Yellow Springs|
GLEN HELEN NATURE PRESERVE Latitude and Longitude:
|Area||1,000 acres (400 ha)|
|Governing body||Antioch College|
The Glen Helen Nature Preserve is a nature reserve immediately east of Yellow Springs, Ohio, United States. The land area was given to Antioch College by Hugh Taylor Birch in memory of his daughter Helen Birch Bartlet in 1929 and is the largest private nature preserve in the region.  
The Glen is immediately adjacent to the main Antioch College campus (which itself contains restored natural areas managed by The Glen)  and stretches in land area for approximately 1000 acres (4 km²). It is also adjacent to John Bryan State Park, all together comprising a 2,000-acre contiguous river corridor that’s been rated “exceptional” by the Ohio Department of Natural Resources for its cleanliness and biodiversity.  'The Glen' is managed by the college's Glen Helen Ecology Institute. The preserve was designated a National Natural Landmark in 1965. 
The Glen features more than twenty miles of publicly accessible trails and includes 2.5 miles of the National Scenic Little Miami River, regionally significant stands of old-growth forest, a distinct rock column known as Pompey’s Pillar, ecologically reclaimed farm land, the Orators Mound (a Hopewell burial mound, and the Yellow Spring, for which the town is named.    
The preserve is a learning laboratory for Antioch College, supporting academic offerings as well as faculty and student research, and also offers a wide variety of public programs and outreach to the wider Miami Valley region.
A number of facilities are located throughout The Glen. The Vernet Ecological Center (named for Sergius Vernet who invented the wax thermostatic element) is located on the western edge of The Glen and houses the visitors center, a nature shop, auditorium, offices, and the Atrium Gallery which exhibits contemporary art by local and regional artists. The nearby Trailside Museum features hands-on displays and exhibits. The Glen Helen Outdoor Education Center (OEC) can be found in the northeast corner of the Glen Helen Nature Preserve. The OEC hosts school and other organizational groups and has developed programs to develop their appreciation of the natural world and an awareness of environmental problems along with the ecological principles that influence them. Adjacent to the OEC is the Raptor Center which rehabilitates injured birds with the goal of releasing them back to the wild, and also offers education about raptors and their role in Ohio ecosystems. Camp Greene, a former Girl Scout Camp which added about 30 acres to The Glen in 2015, offers a dorm and 1920s era lodge which can be rented for groups and functions.  
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