Rainforest
ʻĪao Valley is covered in dense rainforest, most of which consists of introduced vegetation on the valley floor. The Puʻu Kukui summit area at the valley's head receives an average 386 inches (9.8 m) of rainfall per year, making it the state's second wettest location after Mount Waiʻaleʻale. Much of this rainfall ends up flowing into the ʻĪao Stream. Trails in the State Park run alongside ʻĪao Stream and through the forest.
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