In 1990 Rafelson directed Mountains of the Moon, a film about the 1857–58 journey of Richard Francis Burton and John Hanning Speke in their expedition to central Africa — the project that culminated in Speke's discovery of the source of the Nile River. It starred Patrick Bergin as Burton and Iain Glen as Speke, and was hailed by critic Roger Ebert as "completely absorbing." Ebert continued, "It tells its story soberly and intelligently, and with quiet style... It's the kind of movie that sends you away from the screen filled with curiosity to know more about this man Burton." In Newsweek, critic Jack Kroll wrote, "The exploits of Sir Richard Francis Burton make Lawrence of Arabia look like a tourist. . . . From scene to scene this film grips you as few movies do, moving between Africa and England to spotlight an extraordinary range of characters in both 'primitive' and 'civilized' cultures: from the African tribal chiefs, mild or murderous, to the nabobs of the Royal Geographical Society, honest or treacherous." Rafelson later observed, "I was very lucky to make that movie. And I can tell you, if there was ever a movie that I enjoyed making, it was that one."