Kittatinny Mountain is the dominant geological feature in the parts of the Minisink located within New Jersey. It is part of the Appalachian Mountains, and part of a ridge that continues as the Blue Ridge or Blue Mountain in Eastern Pennsylvania, and as Shawangunk Ridge in New York. It begins in New Jersey as the eastern half of the Delaware Water Gap, and runs northeast to southwest along the Delaware River. Elevations range from 1,200 to 1,800 feet and attains a maximum elevation of 1,803 feet at High Point, in Montague Township. Between Kittatinny Mountain and the Delaware River is the Walpack Ridge, with elevations of 500 to 800 feet. It is a smaller ridge that parallels Kittatinny Mountain between the Walpack Bend and Port Jervis, New York, and encloses the watershed of the Flat Brook which is also called Walpack Valley.