What are the two mountain ranges located on Oahu?

The two mountain ranges located on Oahu are the Koolau Mountains and the Waianae Mountains. The Koolau Mountains run along the eastern side of the island and are known for their lush greenery and steep cliffs. This range is recognized for its dramatic landscape and serves as a central feature of Oahu’s geography.

Conversely, the Waianae Mountains are situated on the western side of the island. This mountain range is generally drier than the Koolau Mountains, characterized by rugged terrain and scenic vistas. Together, these two ranges significantly contribute to the island's ecology and are popular destinations for hikers and nature enthusiasts.

Other options mentioned include Mauna Kea and Mauna Loa, which are both located on the Big Island of Hawaii, and Haleakala, found on Maui. Hence, these alternatives do not apply to Oahu, reinforcing the selection of Koolau and Waianae as the correct answer.