Three Notch Trail is a hiking and biking trail in Saint Mary's County and Charles County, Maryland. It is three miles long and begins at 161 feet altitude. Traveling the entire trail is 6.0 miles with a total elevation gain of 112 feet. The Saint Mary's County Library - Charlotte Hall Branch (elevation 164 feet) library and the Charlotte Hall Military Academy (historical) (elevation 164 feet) school can be seen along the trail.
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