Hanalei River

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Coordinates: 22°13′04N″N 159°30′03″W / <span class="geo-dec geo" title="Maps, aerial photos, and other data for Expression error: Unrecognised word "n" -159.50083">Expression error: Unrecognised word "n", -159.50083

Lower Hanalei Valley as seen from the overlook near Princeville. Hanalei (town) is to the right.

The Hanalei River on the Hawaiian island of Kauaʻi flows north from eastern slopes Mount Waialeale for 17 miles (27 kilometers) until entering the Pacific Ocean at Hanalei Bay as an estuary. With a long-term mean discharge of 216 cubic feet (6.12 cubic meters) per second,[1] in terms of water flow it is the second-largest river in the state; although its watershed of 19.1 square miles is only sixth-largest on Kauaʻi, it encompasses areas of the highest recorded rainfall on the planet and plunges precipitously from its headwaters at 3500 feet above sea level.

The lower, flatter portion of the river flows by Hanalei National Wildlife Refuge and many taro farms (60% of Hawaii's taro is grown in this area). The Hanalei River provides habitat for a number of amphidromous species, including gobies (5 native varieties), two native species of crustacean, the hihiwai (an edible snail), and in its upper reaches, a threatened species of highly-adapted snail (Newcomb's snail, Erinna newcombi).

The Hanalei was designated an American Heritage River by US President Bill Clinton on July 30, 1998.