This wide pass through the Flathead Mountains, at the southern end of the range, connects the Fublio and Frigid River Valleys, and is reputed to be the only crossable point along the entire range. The Zorbel Pass was the site of the Diablo Massacre in 666 GUE.  In 883 GUE, the highest point of the pass was blocked by a recent avalanche.

SOURCE(S): Zork I (The History of the GUE), Zork Zero