Pu‘u ‘Ō‘ō cone and surroundings as of Mar. 2001

Pu‘u ‘Ō‘ō cone and surroundings as of March 2000 showing the area covered (dark gray) by lava since February 1997 during episode 55. Inside the crater of Pu‘u ‘Ō‘ō, the "trough" is the drained lava pond of September-October 1999. The central portion of the trough was briefly filled with active lava in February 2000.

Puka Nui is the prominent collapse pit on the southwest flank of Pu‘u ‘Ō‘ō, which is floored with lava erupted September-October 1999.