Madison Boulder, Glacial erratic in Madison, United States.
The Madison Boulder spans 25 meters in length, 7 meters in height, and 7 meters in width, forming a massive granite structure in New Hampshire.
The granite boulder was transported and deposited during the last glaciation period approximately 14,000 years ago, demonstrating the force of ancient ice sheets.
The New Hampshire Division of Parks and Recreation manages this National Natural Landmark, which received its designation from the National Park Service in 1970.
Visitors can access the 17-acre Madison Boulder Natural Area throughout the year, though facilities and staff presence are limited during off-season periods.
This enormous rock formation stands as North America's largest documented glacial erratic, with an estimated weight exceeding 4,500,000 kilograms.
Location: Madison
Height: 7 m
Length: 25 m
Width: 7 m
Made from material: granite
GPS coordinates: 43.93146,-71.16780
Latest update: March 3, 2025 20:10
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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