New Jersey, United States
Mount Tammany is the southernmost peak of the Kittatinny Mountains in Warren County, New Jersey. It is 1526 feet tall, and forms the east side of the Delaware Water Gap. The mountain is named after the Lenni Lenape chief Tamanend. It lies along the Appalachian Trail in Worthington State Forest. The summit can be hiked by the Mount Tammany Trail ascending the western slopes. This trail head is accessible from Interstate 80.