Disney+ just dropped the Disney Nature documentary, "Elephant," narrated by Meghan, the Duchess of Sussex -- and the teaser just aired on 'GMA.' The doc, of course, is special to her. She's done a ton of work in the past to help elephants, and proceeds will go to help an org near and dear to her ... Elephant Without Borders.

Meghan narrates the migration of Shani and her family. The elephant family is tracked as they make a 1,000-mile, 8-month trek across Africa. Ya gotta listen reaaaal closely, 'cause it almost doesn't sound like Meghan. But, it's her.

As we reported ... Meghan's making her Hollywood comeback nearly a year after Prince Harry went to bat for Meghan when he pitched former Disney head Bob Iger.