When the Mountain Came to Miramar is a science fiction novella by American author Charles W. Diffin.
It is magic against magic as Garry Connell bluffs for his life with a prehistoric savage in the heart of Sentinel Mountain.
When the Mountain Came to Miramar was first published in Astounding Stories, March 1931.
Charles W. Diffin (1884–1966) was a US engineer, airplane salesman and science fiction writer. He was one of the better writers whom Harry Bates encouraged to write for the new Astounding Stories.