Baldpate Mountain  Baldpate Mountain is a peak of Upper Pohatcong Mountain in Warren County, New Jersey, United States. This peak rises to , and is located in Mansfield Township. It is part of the New York–New Jersey Highlands of the Reading Prong. It was the setting of Seven Keys to Baldpate (novel), followed by a play and several film adaptations. It was also a key location in the slenderverse ARG wed series EverymanHYBRID.