The Appalachian zone, which consists of Kittatinny Mountain and Kittatinny Valley, extends across the northwestern part of the state from the Delaware River in the vicinity of the Delaware Water Gap to the New York state line. The width of this belt varies from twelve to fourteen miles. The Kittatinny Mountain extends along the Delaware River for thirty miles in the northwestern corner of the state. It extends into Pennsylvania, where it is known as Blue Mountain. The height of this range varies from 1500 feet to 1800 feet. Its highest point and the highest in the state is High Point, which has an elevation of 1804 feet. The Kittatinny Valley is on the southeast side of Kittatinny Mountain and runs parallel with it. [Illustration: Relief map of New Jersey] The Appalachian zone, with its rugged surface, extensive forests, and many lakes, is noted for its beautiful scenery, which attracts many summer visitors. The Delaware Water Gap is particularly noted on this account. This is a break in the Kittatinny Mountain through which the Delaware River flows. Because of the rough surface this section of the state is not adapted to agriculture, although on the bottom lands bordering on the streams and in the Kittatinny Valley there are many farms devoted to the raising of crops and to grazing. The second zone, The Highlands, immediately southeast of the Appalachian zone, extends from the Delaware River into New York. Its southeastern boundary passes near Morristown and Boonton. This zone is from ten to twenty miles wide. Its height generally varies from 900 feet to 1400 feet. Hamburg Mountain and Wawayanda Mountain reach an altitude of 1469 feet. The Highlands, as well as the Appalachian zone, belong to the Appalachian region, but in New Jersey the term "Appalachian" is applied only to the region consisting of Kittatinny Mountain and Valley. The Highlands contain many irregular mountain masses, interspersed with fertile valleys, and much forest land. The zone contains, besides, many lakes, most of which are of glacial origin. The section is consequently one of great natural beauty, and is a popular resort for many who desire out-door recreation. There is much fertile farm land and land suitable for grazing. Parts of it are specially suitable for the raising of peaches and other fruits. It contains many valuable mineral deposits, including gravel, cement rock, zinc, and iron. Next to the Highlands and parallel with it is the Piedmont Plateau. This extends from the Delaware River to the northeast corner of the state and is about thirty miles wide. Its southeastern boundary is a line running from Trenton to Woodbridge in Middlesex County, which represents in this state the Fall Line (Sec. 47). It comprises about one fifth of the area of the state. Its elevation varies from sea level to about 900 feet.