A Week on the Concord and Merrimack Rivers is a book by Henry David Thoreau. It is ostensibly the narrative of a boat trip from Concord, Massachusetts to Concord, New Hampshire, and back, that Thoreau took with his brother John in 1839. While the book may appear to be a travel journal, broken up into chapters for each day, this is deceptive. The actual trip took two weeks and while given passages are a literal description of the journey — from Concord, Massachusetts, down the Concord River to the Middlesex Canal, to the Merrimack River, up to Concord, New Hampshire, and back — much of the text is in the form of digressions by the Harvard-educated author on diverse topics such as religion, poetry, and history.