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Maui, Hawaii. Iao Valley is a lush, stream-cut valley in West Maui, Hawaii, west of Wailuku. Because of its natural beauty and historical significance, it has become a popular tourist location.The state park is located on 6.2 acres at the end of Iao Valley Road (Highway 32). The Iao Needle (Kkaemoku) is a famous landmark in the state park, a vegetation-covered lava remnant rising 1,200 feet from the valley floor. The needle is surrounded by the cliffs of the West Maui Mountains, an extinct volcano.