Final answer:
The Blue Mountains are part of a larger mountain system or range. In Australia, they are near the Wollemi and Kanangra-Boyd National Parks, while in the United States, they are close to the Cascade Range.
Step-by-step explanation:
When referring to the Blue Mountains, it's important to specify which country's geographic region we are discussing, as there are several mountain ranges known by this name around the world. In Australia, the Blue Mountains are part of the Great Dividing Range and are adjacent to the Wollemi and Kanangra-Boyd National Parks, rather than being close to another singular mountain. If the question pertains to the Blue Mountains in the United States, they extend through Oregon and Washington, and the nearest mountain ranges would include the Cascade Range to the west.