The skylight is surrounded by basaltic lava flows from the past.
Puʻu ʻŌʻō (often written Puu Oo, and pronounced [ˈpuʔu ˈʔoːʔoː], roughly "poo-oo oh-oh") is a cinder/spatter cone in the eastern rift zone of the Kīlauea volcano of the Hawaiian Islands. Puʻu ʻŌʻō has been erupting continuously since January 3, 1983, making it the longest-lived rift-zone eruption of the last two centuries.