Madison Boulder, Glacial erratic in Madison, United States.
The Madison Boulder is an enormous granite block rising from the forest floor in Madison, New Hampshire. This single rock dominates the landscape around it, with trails winding through the surrounding woodland area.
The stone was transported and deposited by glaciers roughly 14,000 years ago during the last ice age. This movement shows the tremendous power that ice sheets wielded as they shaped the landscape.
The New Hampshire Division of Parks and Recreation manages this National Natural Landmark, which received its designation from the National Park Service in 1970.
The natural area is open year-round for visitors to explore on foot through woodland trails. Winter conditions can bring snow and ice to the paths, so sturdy footwear and careful footing are advisable.
It is the largest documented glacial erratic in North America, and its sheer size makes it difficult to take in all at once. Visitors often stand in wonder trying to grasp how a single stone of such enormous size ended up in this location.
Location: Madison
Height: 7 m
Length: 25 m
Width: 7 m
Made from material: granite
GPS coordinates: 43.93146,-71.16780
Latest update: December 6, 2025 17:42
New Hampshire reveals a land where the White Mountains have shaped the skyline for millennia. Between northern coniferous forests and southeastern Atlantic coasts, this New England state features waterfalls cascading over granite, glacial passes carved 15,000 years ago, and industrial villages embedded in red stone. Archaeological sites, lighthouses guiding ships on Piscataqua, and estates where early 20th-century artists shaped American identity await discovery. Trails wind through gorges, along lakes reflecting peaks, and through forests where remnants of old foundries remain. Autumn light illuminates maple trees, winter turns ravines into ice amphitheaters, and spring causes waterfalls to roar. From Mount Monadnock to the Shoals Islands, New Hampshire offers a varied geography where each hill, waterfall, and stone bears witness to a deeply rooted natural and human story within the landscape of New England.
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