Thorn Valley is a place that is mentioned in The Secret of NIMH. It was seen in the sequel. Trivia The Thorn Valley is a parody to The Great Valley from The Land Before Time. This article is a stub. You can help Don Bluth Wiki by expanding it. Retrieved from "https://donbluth.fandom.com/wiki/Thorn_Valley?oldid=29565" Categories: Article stubs Locations The Secret of NIMH Locations Community content is available under CC-BY-SA unless otherwise noted.