Rainier

Wizard island is a small island volcano w/in the larger crater of this huge caldera. Crater Lake caldera formed by collapse during the catastrophic eruption The 8x10 kilometer caldera lies in the remains of Mount Mazama, a Pleistocene stratovolcano cluster covering 400 square kilometers in the southern Oregon Cascades. Prior to its climactic eruption, Mount Mazama's summit had an elevation between 10,800 - 12,000 feet. -- Bacon, 1990, IN: Wood and Kienle