Puʻu ʻOʻo

Volcano in Hawaiʻi Volcanoes National Park

While Halemaʻumaʻu gets featured in the most Hawaiʻi volcanoes selfies, Puʻu ʻOʻo vent is doing the majority of Kilauea's dirty work. It is the longest-lasting and most voluminous of the volcano's eruptions, oozing an estimated 80 to 160 million gallons of lava per day, or 120 to 240 Olympic-sized swimming pools' worth. Hiking to Puʻu ʻOʻo is prohibited; be wary of any guide who tells you otherwise.

Originally called Puʻu O after a cartographic coincidence – the eruption started in 1983 smack in the middle of a letter 'o' on the map – Kalapana elders later bestowed the name ʻOʻo meaning 'the stick for digging', recalling stories of Pele.