Walden Pond is a 64 acre lake situated in the 335 acre Walden Pond State Reservation. It was declared a National Historical Landmark in 1962. The lake is known as a kettle hole, a depression left by retreating glaciers that fills with water. It was made famous by Henry David Thoreau who wrote about it in his famous work, 'Walden'. For two years he lived in a cabin near the shore, on land owned by his friend, Ralph Waldo Emerson. A replica of his cabin has been erected and signposted. At the same time, ice from the lake was being harvested and exported to tropical countries. The park is open for hiking and water activities.

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