Essayist, poet, and philosopher Henry David Thoreau (1817–62) ranks among America's foremost nature writers.

The Concord, Massachusetts, native spent most of his life observing the natural world of New England. His thoughts on leading a simple, independent life remain a foundation of modern environmentalism, as captured in Walden, his best-known work. Canoeing in the Wilderness, the 1857 diary of a two-week sojourn in Maine, chronicles the author's travels with a friend and a Native American guide.

In the mid-nineteenth century, the Maine woodlands were still in pristine condition, inhabited by a handful of Native Americans, pioneer farmers, the occasional lumberjack, and a rich and diverse wildlife population.

Thoreau's poetic yet realistic observations of the landscape are accompanied by his accounts of day-to-day events. From camping by the waterside and waking to birdsong to enduring mosquitoes and cloudbursts, he writes with grace and clarity that bring the American wilderness to vivid life.