Moss Island is an island in Little Falls, New York, located between the Mohawk River and the New York State Barge Canal. It is composed of an igneous intrusion of syenite, and became an island when canal locks were built so boats could avoid the 40-foot (12 m) falls. It is known for its large 40–50-foot (12–15 m) deep potholes as well as being popular with local rock climbers. It was declared a National Natural Landmark in 1976.
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