This 120-acre city-owned park sits on a former strip-mine, then unofficial dump site. Left alone for thirty years, 13 separate ecosystems developed, including oak hammock, fresh water ravine, upland sand hill and salt marsh. The terrain is not flat like most of Jacksonville; it has a ravine 800 feet long and sloping hills. Florida wildlife make their home at JAG, as well as hawks, osprey, owls, and numerous species of smaller birds.
Various trails wind through the site, around a 2-acre lake, following the rim of the 185 feet wide by 25 feet deep ravine, and under live oak trees that are more than 100 years old.