The Oregon spotted frog ("Rana pretiosa") is a medium-sized water frog. The name "Rana pretiosa" means "precious frog". It comes from the Pacific Northwest area of North America. It can be found in the Puget Trough/Willamette Valley province and the Cascade Mountains of south-central Washington and Oregon. It is a rare frog and is listed by the IUCN as a vulnerable species.