Spanning 60,000 acres, the Sourlands region is a reservoir of biodiversity in central New Jersey. D&R Greenway has already facilitated the preservation of more than 3,400 acres in the Sourlands and is a leading partner with state, county and municipal officials, and private landowners, to continue preservation of this region. More than 150 bird species have been recorded in the Sourland forests. Numerous species require the large, unfragmented tracts of closed-canopy forest that remain in the Sourlands in order to breed successfully.