From Rainbow Falls Hawaii visitors can also hike upstream to Boiling Pots. With a recent rainfall, the river convulses through a series of "pots" giving the spot its name. Under the river lies a layer of old lava and as the water rushes through it bubbles to the surface creating the appearance of pots of boiling water. To the left of Boiling Pots there is another waterfall showcasing five burgeoning spouts of water, called Pe'e Pe'e Falls.