The Wailuku River is a 28.0-mile-long (45.1 km) water course on the Island of Hawaiʻi in the Hawaiian Islands. It is the longest river in Hawai'i and the largest in the state by mean discharge. Its course lies mostly along the divide between the lava flows of Mauna Kea and those of Mauna Loa to the south. It arises at about the 10,800 feet (3,300 m) elevation along the eastern slope of Mauna Kea (19°48′26″N 155°25′13″W). It flows generally eastward, descending steeply from the mountain and entering the Pacific Ocean at Hilo.
Wailuku River State Park is located along the lower reach of the ...
Click any point for details. Sections without stored geometry are drawn as straight put-in → take-out lines — actual courses follow the river.