maui is a volcanic doublet: an island formed from two volcanic mountains that are joined. the older volcano, mauna kahalawai, is much older and has been very worn down. in common talk it is called the west maui mountain. the larger volcano, haleakala, rises above 10,000 feet (3,050 m). the last eruption of haleakala happened over 200 years ago, and this lava flow can be seen between ahihi bay and la perouse bay on the southeast shore.