Methven also served as a base to cast and crew for the filming of Edoras (located further inland), for The Lord of the Rings.
The river formed the Rangitata Valley, in the center of the Southern Alps, and the on-location photography of the Edoras set from The Lord of the Rings: The Two Towers, and The Return of the King was filmed in this valley, on and around Mount Sunday.
Features of the Rockall Plateau have been officially named after features of Middle-earth in the fiction of J. R. R. Tolkien, e.g. Eriador Seamount, Rohan Seamount, Gondor Seamount, Fangorn Bank, Edoras Bank, Lorien Knoll, Isengard Ridge.