Detailed view can be seen at "Original" - also see history of pond below.

Henry David Thoreau lived at Walden Pond from July 1845 to September 1847.
His experience at Walden provided the material for the book Walden,
which is credited with helping to inspire awareness and respect for the
natural environment. Because of Thoreau's legacy, Walden Pond has been
designated a National Historic Landmark and is considered the birthplace
of the conservation movement.