The Pathfinder, or The Inland Sea is an historical novel by James Fenimore Cooper first published in 1840. It is the fourth novel Cooper wrote featuring Natty Bumppo, his fictitious frontier hero, and is considered as forming the third chronological episode of the Leatherstocking Tales. The inland sea of the title is Lake Ontario. In 1973, a simplified version of the novel by Robert James Dixson was published by Regents Pub. Co.