Most of the familiar geographic landmarks of eastern Oʻahu were created by eruptions from Koʻolau from about 500,000 to 10,000 years ago.
Sebagian besar peristiwa geografis Oʻahu timur dikenal tercipta oleh letusan dari Koʻolau dari sekitar 500.000 sampai 10.000 tahun yang lalu.