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Walden Pond

Pond in Massachusetts
Walden Pond is a celebrated pond in Concord, Massachusetts, in the United States. A good example of a kettle hole, it was formed by retreating glaciers 10,000–12,000 years ago. Wikipedia
Max. depth: 102 ft (31 m) or 107 ft (33 m)
Area: 61 acres
Designated NHL: December 29, 1962
NRHP reference No: 66000790
Shore length1: 1.7 miles (2.7 km)