The park is known to contain at least one globally imperiled plant, Torrey's mountain mint (Pycnanthemum torrei), as well as three other plants endangered within New Jersey.
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In 1908, the Feickerts moved North Plainfield Township, near the foothills of Watchung Mountains.
Campgaw Mountain, the northernmost ridge of the volcanically formed Watchung Mountains
Preakness Range, a range of the Watchung Mountains in northern New Jersey
Union Hill is located near the village of Suffern in Ramapo, New York, about three and a half miles north of the Watchung Mountains, or about halfway between the Ladentown Outlier and Campgaw Mountain.