Interior geography …

… How Writers Map Their Imaginary Worlds - Atlas Obscura. (Hat tip, Rus Bowden.)

… there are more private treasures here, too: J.R.R. Tolkien’s own sketch of Mordor, on graph paper; C.S. Lewis’s sketches; unpublished maps from the notebooks of David Mitchell, who uses them to help imagine the worlds of his books, such as The Thousand Autumns of Jacob de Zoet; Jack Kerouac’s own route in On the Road (a fantasy of a different kind, no less obsessed over).