"Maui is a volcanic doublet: an island formed from two volcanic mountains that abut one another to form the isthmus between them. The older volcano, Mauna Kahalawai, is much older and has been eroded considerably; it is now called the West Maui Mountain. The larger volcano in the East, Haleakala- with its famous caldera - rises above 10,023 feet (3,050 m). The last eruption occurred around 1790, and the lava flow can be viewed between 'A-hihi Bay and La Perouse Bay on the southwest shore of East Maui. Both volcanoes are shield volcanoes and the low viscosity of the Hawaiian lava makes the likelihood of large explosive eruptions negligible." -- Except from Wikipidia, The Free Encyclopedia