Boiling Pots of Wailuku

Known as the “Boiling Pots,” Pe‘epe‘e Falls is a section of the 18-mile-long Wailuku River, of which Rainbow Falls is also a part. The second longest river in Hawaiʻi, Wailuku River flows along the line where lava from both Mauna Loa and Mauna Kea meet. The river eroded a gorge in the two lava flows, which were also filled twice by younger lava flows from Mauna Loa.