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Haleakala began growing on the ocean floor roughly 1-2 million years ago. It erupted most recently in 1790 at La Perouse Bay. Hualalai is an active volcano. The resort town of Kailua is on the southwest flank of the volcano. Hualalai last erupted in 1801 and sent lava from a vent on its northeast rift down to the ocean.
Volcanoes. The oldest is Kohala Volcano, which is believed to have emerged from the sea more than 500,000 years ago. Over the centuries, lava flows from its two neighbors, the much larger Mauna Loa and Mauna Kea volcanoes, have buried a portion of Kohala. Today, Kohala is considered to be an extinct volcano. Mauna Kea is the tallest of Hawaiiâs volcanoes; in fact, standing at 13,796 feet, it is the worldâs tallest mountain (measured from the floor of the ocean to its summit). Mauna Kea is considered a dormant volcano, having last erupted about 4,500 years ago.