The Lovers' Wind (1978)

The Lovers' Wind is a 1978 French documentary film directed by Albert Lamorisse about the landscape of Iran. Lamorisse was killed in a helicopter crash while filming the documentary, during a helicopter-tour of Iran. His widow and son completed the film, based on his production notes, and released the film eight years later in 1978. It was nominated for a posthumous Academy Award for Best Documentary Feature.

More at Wikipedia.