Then again, it could be this one; though I'm happy to bow to the authority of anyone who, unlike myself, has actually *seen* the film!
I've read the book several times and what you describe could pass quite happily for a Hollywood interpretation of the book's ending.
The book end thusly (spoilers to anyone who hasn't read the book [or, presumably, seen the film....]!):
They're not in a desert, but they climb fifty-feet up a cliff; follow a ledge on the cliff-face to a cave; go through the cave into a chasm which is partially bridge by a rock spur and a balanced rock; cross the chasm by means of a plank of wood they've brought for the purpose; follow through several further tunnels, caves and passageways until they arrive in a final room, wherein they discover a rolling pillar of fire into which the woman steps.
*Shrugs*. I can see why your friend my think it was this film. But, as I say, I haven't actually seen the film; I've only read the book. Just putting in a little extra information in case you need some. :)
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