One of several falls along the path of the Wailuku River in Hilo, Rainbow Falls is a gorgeous waterfall to visit early in the morning. Its name originated from the fact that on some early mornings a rainbow can be seen arching across the falls. Waianuenue Falls is its Hawaiian name which means "rainbow seen in water." Like all waterfalls, Rainbow Falls' display is dependent on recent rainfall.


http://www.hawaii-guide.com/big_island_of_hawaii/sights/rainbow_falls_state_park

http://www.to-hawaii.com/big-island/waterfalls/rainbowfalls.php
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