Tags: Mountain Range.
The Plomosa Mountains are a mountain range in La Paz County Arizona running generally south of Bouse Arizona near the Arizona/California border. Quartzsite lies to the west across the La Posa Plain. The Harcuvar Mountains and Little Harquahala Mountains lie to the east across the Ranegras Plain. The New Water Mountains lie to the southeast beyond Black Mesa.Interstate 10 crosses the center of the range.