Tim,
Green's pond was renamed Mt. Lake. It is located in Liberty Twp., Warren Co., NJ.If you have a map of NJ, it is located off US 46 near Hope to the north west and Great Meadows to the south east. Jenny Jump Mtn. is also located in Great Meadows and Hope. It is near Mt. Lake.
Oxford, NJ is located (Guessing now a bit) about3 to 4 miles south of Mt. Lake. I hope I didn't confuse you with my directions. I live about a mile east of Mt. Lake. It really is a pond, but don't tell any of the residents that. The Green family were early settlers and property owners there, thus the name. Hope this helps.
Bob