McLean Bogs in Dryden, New York, is a protected 81-acre natural area of woodland and two small kettle bogs, notable because one bog is acidic and the other alkaline. Given to Cornell University by Curtis G. Lloyd in the 1930s and recognized as a National Natural Landmark in May 1983, the site is valued for its unusual ecology. The acidic bog includes a basin about 70 metres wide with peat roughly eight metres deep and several species of sphagnum moss. The bogs also support more than 66 lichen species, and the area remains important for scientific research, including studies of methane-producing microbial communities in peat.