The Concord had rarely been a river, or rivus, but barely fluvius, or between fluvius and lacus. This Merrimack was neither rivus nor fluvius nor lacus, but rather amnis here, a gently swelling and stately rolling flood approaching the sea. We could even sympathize with its buoyant tied, going to seek its fortune in the ocean, and anticipating the time when "being received within the plain of its freer water," it should "beat the shore for banks."
Henry David Thoreau (1817–1862), U.S. philosopher, author, naturalist. A Week on the Concord and Merrimack Rivers (1849), in The Writings of Henry David Thoreau, vol. 1, p. 113, Houghton Mifflin (1906).