As Boston's second largest unfragmented woodland, Allandale Woods is a crucial component of the City's natural areas inventory. Allandale Woods is located west of Arnold Arboretum on the Jamaica Plain and West Roxbury line and is bordered roughly by Allandale Street, Centre Street, the VFW Parkway, and Hackensack Road. The acquisition of a portion of the conservation land at Allandale Woods in 1975 represented the first step in creating the Charles-to-Charles Open Space Corridor, an 8-mile open space belt of existing parkland, private estates, and wetlands that stretches from the Fens and the Charles River Basin, along the Boston and Brookline boundary, and through the Sawmill marshes to the Charles River in West Roxbury. Composed primarily of oaks, maples, and pines, Allandale Woods is one of the few relatively pristine secondary growth oak-hickory forests in the city of Boston. Trails, recently rehabilitated in 2009 in partnership with summer youth conservation crews from Boston Natural Areas Network and Student Conservation Association, run throughout the site leading to various areas of interest including scenic Rock Pond, an extensive Depression-era stone boundary wall, a cattail marsh, intertwining streams that form the Bussey Brook headwaters, underground springs, an historic spring house, and a certified vernal pool.