This big-budget adaptation of James Michener's best-selling novel stars Michael Sarrazin as Mark Miller, a low-level American diplomat given a dangerous assignment. Ellen Jasper (Jennifer O'Neill) is the daughter of a prominent U.S. politician who has married Nazrullah (Behrooz Vosoughi), an Iranian colonel. However, she's fallen in love with Zulfigar (Anthony Quinn), a Bedouin rebel leader, and has run off with him. Miller is instructed to find Ellen and bring her back to the United States, and while he's able to complete the first part of his assignment, Ellen simply refuses to leave Zulfigar's side. Caravans was a co-production between American and Iranian firms, but it had the misfortune of being released just as relations between the two nations began to sour, which did nothing to help the film at the box office.
~ Mark Deming, All Movie Guide