The water pictured crashing down the side of Waimea Canyon, on the Hawaiian island of Kauai, has come from one of the rainiest places on Earth. Waipo"o Falls is fed by water from Mount Wai"ale"ale, a shield volcano whose name means "overflowing water." The mountain is often shrouded in clouds and experiences a huge amount of rainfall each year—which helps explains those spectacular rainbows.
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