Osmun Forest Natural Area
Knowlton Township, Warren County, NJ

Management Objective: preservation of a northeastern mixed hardwood forest

Interim Classification: ecological reserve

Administering Agency: Division of Parks and Forestry, through Jenny Jump State Forest

(Source: http://www.state.nj.us/dep/enforcement/relprev/dpcc/document/esaguide.htm)

There is an Osmun Road near the southern end of Honey Run Wildlife Management Area, which might be the location of the place. I will have to check it out.