DreamingHawaii.com » Hawaii Islands » Kauai, the Garden Isle » Kauai Attractions » Wailua River
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The 20-mile-long Wailua River is the only navigable river in the state of Hawaii. It is fed by Mount Waialeale, a 5,148-foot mountain that is the wettest spot on earth. The tour boat in the photo is probably heading to a place called Fern Grotto, a small cave completely covered with greenery.