Walden Pond is a lake in Concord, Massachusetts in the United States. A famous example of a kettle hole, it was formed by retreating glaciers 10,000–12,000 years ago.The writer, transcendentalist, and philosopher Henry David Thoreau lived on the northern shore of the pond for two years starting in the summer of 1845. His account of the experience was recorded in Walden; or, Life in the Woods, and made the pond famous. The land at that end was owned by Thoreau's friend and mentor, Ralph Waldo Emerson, who let Thoreau use it for his experiment. Concord Museum contains the bed, chair, and desk from Thoreau's cabin.