Residential Land Development Opportunity in Mantua Township. Mantua Township is located in the middle of Gloucester County, New Jersey and 16 miles outside of Philadelphia. It is situated on an elevated bluff overlooking Mantua Creek, from which the township derives its name. Approximately 25.61 acres situated in Mantua Township's Agricultural Residential Zone. Surrounded by niche residential clusters on Breakneck Road. Bring your vision to life and create your own secluded homestead or build a small residential cluster for resale.