Panoramic view of trail leading up to the Kalu ʻUoka ʻŌʻō cinder cone in the Haleakalā crater in Maui, Hawaii. The Haleakalā volcano has erupted three times in the last 900 years. Lava flows generally fill the surface of the crater before flowing down one of its two valleys, Koʻolau (visible here in the background) or Kaupō.