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Clark Reservation State Park is a state park in Onondaga County, New York. The park is in Jamesville, NY, in the Town of DeWitt, south of Syracuse. It was the site of a large waterfall formed by melting glacial ice at the end of the last Ice Age; the plunge basin at the base of the old falls is now a small lake. James Macfarlane described the area in 1879, "On approaching the lake from the turnpike on the south side, the tourist is startled at finding himself, without any notice, on the brink of a yawning gulf, precisely like that of the Niagara River below the Falls, and nearly as deep." Clark Reservation is also noted for its many ferns; it harbors the largest population in the U.S. of American hart's tongue, which is so rare that it was declared endangered in the U.S. in 1989. The park is 377 acres (153 ha) in size, and logs over 160,000 visitors per year. It encompasses the cliff, plunge basin and gorge of the ancient waterfall, and a number of secondary ravines and basins. Glacier Lake, which occupies the plunge basin of the former waterfall, is 6.2 acres (2.5 ha) in size and 52 feet (16 m) deep; it is a rare meromictic lake in which the deep waters don't mix annually with the surface waters. The surrounding limestone cliffs are 180 feet (55 m) high. Hiking trails skirt a half-ring of cliffs surrounding the lake, as well as traversing the rugged limestone over which the old river flowed.