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Iao refers most commonly to Iao Valley, a rugged and lush gorge located on the island of Maui in Maui County, Hawaii, United States. The valley is cut by the Iao Stream and lies in the western part of the island, near the town of Wailuku. It is renowned for its dramatic scenery and serves as a focal point of Hawaii’s natural and cultural landscape.

A central feature of the area is the Iao Needle, a prominent basalt rock spire that rises above the valley floor and has become one of Maui’s recognizable landmarks. The valley and its surrounding surroundings are protected as Iao Valley State Monument, preserving a tropical rainforest habitat that visitors can explore via short trails and overlooks.

Historically, Iao Valley holds significance in Hawaiian history and culture. In 1790, it was the site of the Battle of Kepaniwai, part of Kamehameha I’s campaigns to unify the Hawaiian Islands. The valley has long been important to local communities for water, taro cultivation, and spiritual associations, and it remains a symbol of Hawaii’s natural beauty and heritage.

Today, Iao Valley remains a popular destination for residents and visitors seeking scenic views, photographic opportunities, and educational interpretation of Hawaii’s ecology and history. Its combination of dramatic geology, botanical richness, and historic resonance continues to shape its status as a key landmark on Maui.