Question: are there volcanoes on oahu?
Answer: The island on Oahu is formed from two principle volcanoes: Waianae and Koolau. Waianae is about 2.2-3.8 million years old and Koolau is about 1.8-2.6 million years old. ... The island is also riddled in spots by smaller volcanic features such as diamond head, punchbowl, salt lake crater, Koko head and Koko crater, etc..