The beautiful desolation of “Bombay Beach” makes it difficult to describe as a documentary. Alma Har’el’s directorial debut takes a nonfiction setting and displays its haunting qualities in poetic terms. The small, impoverished community where the movie is set – buried in the heat of the Colorado desert in Southern California, on the cusp of the man-made Salton Sea – brings to mind the remnants of a vacation resort in a post-apocalyptic world. These are real people living in an abandoned fairy tale, with little to do besides stare into the horizon and sigh.