Diamond Head sits on top of a much larger volcano, called Koolau, that together with a second large volcano called Waianae forms most of Oahu's land mass. The Koolau and Waianae volcanoes are about 2 ...

that together with a second large volcano called Waianae forms most of Oahu's land mass. The Koolau and Waianae volcanoes are about 2 to 3 million years old. No Oahu volcano is active. The highest ...

that together with a second large volcano called Waianae forms most of Oahu's land mass. The Koolau and Waianae volcanoes are about 2 to 3 million years old. No Oahu volcano is active.

that together with a second large volcano called Waianae forms most of Oahu's land mass. The Koolau and Waianae volcanoes are about 2 to 3 million years old. No Oahu volcano is active. The highest ...