Madison Boulder

 ( Glacial Erratics Of The United States ) 

The Madison Boulder is one of the largest known in North America and among the largest in the world; it is preserved in the Madison Boulder Natural Area in Madison, New Hampshire. The boulder is a huge granite rock measuring in length, in height above the ground, and in width. It weighs upwards of . A part of the block is buried, probably to a depth of . It was acquired by the state from the Kennett family in 1946. In 1970, Madison Boulder was designated as a National Natural Landmark by the National Park Service.

• List of individual rocks

• Madison Boulder Natural Area New Hampshire Department of Natural and Cultural Resources