New Jersey

Relief

New Jersey comprises four distinct physical regions: the Ridge and Valley section of the northwest, where the folded Appalachian Mountains slice across the state; the Highlands, a southern extension of the ancient rocks of New England, which also trend across the state in a northeast-southwest direction; the rolling central Piedmont, where many of the major cities and suburbs are located; and the relatively level Atlantic Coastal Plain, which is divided into an inner and an outer portion. The state’s highest elevation is High Point, at 1,803 feet (550 metres), located just south of the New York border in Sussex county.

The Outer Coastal Plain, with its relatively poor sandy soils, is where the Pine Barrens are located. The best soils are located on the Inner Coastal Plain and on the Piedmont and in valleys in the New England section south of the last glacial advance. Although suburbanization has devoured much of New Jersey’s agricultural land, substantial estates and farms still exist in parts of the Piedmont, and truck farms still dominate many parts of the southern Inner Coastal Plain. The northern Inner Coastal Plain is home to prosperous horse farms, and some dairying still exists in the Ridge and Valley section. The most striking features of the state are its beaches, the Pine Barrens, The Palisades facing Manhattan, the broad marshes and swampland in the northeast, and the hills of the northwest, including the famous Delaware Water Gap.

Drainage

Lakes and ponds cover about 300 square miles (780 square km) of the state’s surface. New Jersey’s major river, which it shares with Pennsylvania, is the Delaware. The Hudson River separates the state from New York. Other major rivers are the Passaic and the Hackensack, both in the northeast, and the Raritan, which runs west to east and is generally regarded as the boundary between North and Central Jersey. Lake Hopatcong, in Sussex and Morris counties, is the state’s largest lake.

Climate

The northwest experiences relatively cold winters, with average January temperatures below 28 °F (−2 °C). Relatively mild conditions prevail in the south, with average winter temperatures above freezing. Summers are relatively hot throughout the state, with averages for July ranging from about 70 °F (21 °C) in the northwest to above 76 °F (24 °C) in the southwest. Moist conditions prevail, with seasonally well-distributed precipitation averaging from 44 inches to more than 52 inches (1,120 to 1,320 mm).

Plant and animal life

Virtually all of the plant life that is common to the northeastern United States can be found in New Jersey, and many rare plant species grow in the marshes and Pine Barrens, including some insect-ingesting plants. The Barrens are dominated, however, by oak and pine on the well-drained sites and by white cedar in the poorly drained bogs. Common trees elsewhere include oaks, sugar maples, hemlocks, birches, ashes, sweet gums, and other deciduous species. Common plants are wild azaleas, rhododendrons, honeysuckles, mountain laurels, wintergreen, and cardinal flowers.

The marshy area west of The Palisades (the Hackensack Meadows, popularly called the Meadowlands) and the Great Swamp of Morris county are relics of glacial lakes of the last Ice Age. The former is dominated by grasses, the latter by trees. The Meadowlands are managed to encourage wise land use and pollution abatement. The Great Swamp, one of several poorly drained areas in the Passaic River basin, is a national wildlife refuge. Elsewhere, increasing suburban development has encroached on wildlife habitats; bears and especially deer have become serious pests. Raccoons and opossums are common, even in many suburbs, and other mammals, snakes, and birds common to the northeastern United States (including migratory species) are also found within the state.