Plummer's Ledge Natural Area in Wentworth, New Hampshire

Wentworth, New Hampshire

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 is a 3.5 acres (1.4 ha) plot of land protected by the State of New Hampshire to preserve unique geologic features called glacial potholes.

Geologists usually account for the isolated potholes, now high and dry, by the plunging of melt water through vertical cracks or crevasses in the glacial ice. These cracks, called moulins

Moulin (geology)

A moulin or glacier mill is a roughly circular, vertical to nearly vertical well-like shaft within the a glacier through which water enters it from the surface. The term is derived from the French word for mill....

, caused water, boulders, cobbles, and gravel to churn with intense cutting power, drilling into the slope of a granite ledge. The three giant potholes at Plummer's Ledge are not only very large and very deep, to 20 feet (6.1 m) enclosed depth, but they were cut straight down into a ledge on its 45-degree side slope.

The area was deeded to the State of New Hampshire on May 7, 1938 by George F. Plummer and is administered by the Department of Resources and Economic Development under the Division of Forests and Lands.