Walden Pond, two miles south of Concord town centre, is the glacial kettle pond where Henry David Thoreau lived from 1845 to 1847 and about which he wrote one of the seminal works of American literature. The pond is 61 acres and about 31 metres deep, remarkably clear, and surrounded by second-growth woodland that has recovered substantially from the 19th-century clearing. Thoreau would recognize the basic landscape, though the swimming beach, parking lot, and Walden Pond State Reservation infrastructure might surprise him.
The swimming here is genuinely good in summer — the water is clean and cold, the beach is sandy, and the surrounding woods provide shade. The trail around the pond (1.7 miles) passes the site of Thoreau's cabin, marked by granite posts, and the cairn of stones left by visitors from around the world. The site can be crowded on summer weekends; arrive early in the morning. There is a parking fee for non-Massachusetts residents. The pond is owned and managed by the state; the Walden Woods Project, dedicated to preserving the broader landscape, maintains an information center in the parking area.