Bear Swamp is a swamp in Cumberland County, southwestern New Jersey, notable for its 215 acre of old-growth forests and the birds they contain. It is divided into two areas, Bear Swamp East and Bear Swamp West, separated from each other by gravel mines and roads.

Bear Swamp West

Bear Swamp West contains broadleaf swamp forest dominated by black gum, American sweetgum, red maple, and sweetbay magnolia. Other trees present are American beech, swamp white oak, and American holly. Some 100 acre of this forest is old-growth filled with trees of impressive sizes and ages. The black gum are nearly 4 ft in diameter and 600 years old. The sweetgum again nearly 4 ft in diameter, and 300 years old. The red maple are over 4 ft in diameter. The American holly are particularly large, reaching 22 in in diameter and 80 ft tall.

Bear Swamp East

Bear Swamp East is in Belleplain State Forest. It covers 1439 acre and contains 115 acre of old-growth forest. It has forests similar to Bear Swamp West, but with large Tulip Poplar on hummocks, some reaching 5 ft in diameter and 400 years of age.

Habitat for birds

As many as 30 bald eagles nest in the swamp, and it is home to the oldest continuously occupied bald eagle nest in New Jersey. It is a breeding site for red-shouldered hawks, barred owls, and Cooper's hawks, all species of concern in the state. It is one of just two known breeding sites in southern New Jersey for pileated woodpeckers.