ʻIao Valley


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Iao Valley

ʻIao Valley, Stream, & Needle

A thousand years ago, Hawaiians gathered at Iao Valley to celebrate and honor the bounty of Lono, the God of agriculture, during the annual Makahiki Festival. More than a hundred years ago, visitors began coming to witness the natural beauty of this valley.

Today, ʻIao Valley is recognized as a very special place for both its spiritual value and spectacular scenery. It’s also very easy to access. Travel to Wailuku Town, and you’re only minutes away from ʻIao.

See ʻIao Valley Map

Kukaʻemoku – ʻIao Needle

During periods of warfare, warriors used the peak as a lookout. It was here that some of the Maui warriors retreated from the forces of Kamehameha I during the Battle of Kepaniwai.

Iao Valley Needle View

Kukaʻemoku is an erosional remnant. It is at the end of a ridge comprised of a denser dike stone. Streams and waterfalls eroded the softer rock around the dike stone.

The Lookout

When you climb the 133 steps to the top, you will be rewarded with a great 360-degree view of ʻIao Valley and Wailuku.


Na Wai Eha – The Four Waters of Maui

The streams of the valleys of Waikapu, Wailuku, Waiehu, and Waiheʻe are known as the four waters. The fertile lands and abundant water made this area the largest agricultural system in Hawaii and a major population center of Maui.

Imagine this landscape 200 years ago. Kalo (taro) fields cover the valley floor with ʻauwai (ditches), diverting water from the streams to irrigate the planted terraces. The hale (houses) of the farmers dot the valley slopes, while the hale of the fishermen lines the shore of Kahului Bay. Halekiʻi and Pihanakalani Heiau on the dune along ʻIao Stream are the religious centers of this very important area.

Iao Valley Waters

With Western contact, the landscape of the Wailuku Plain began to change. By the late 1800s, much of the kalo was gone, and fields of sugarcane irrigated with water from the four streams covered the plain.

Hawaiian History

Wahi Pano O Na Aliʻi – Sacred Place of the Chiefs

From the highest peak of Puʻu Kukui to the shoreline of Kahului Bay, the ahupuaʻa (land division) of Wailuku was a favorite place of Aliʻi (chiefs) and a ruling center of Maui. ʻIao Valley is part of the ahupuaʻa.

Iao Valley Sacred Places

As one of Maui’s most important political centers, many battles took place here. Wailuku translates as the “waters of destruction,” referring to its history of battles and floods.

ʻIao is so sacred that the remains of the highest chiefs were entrusted to secret hiding places in the valley. Kakaʻe, ruler of Maui in the late 1400s to 1500s, is believed to have designated this valley an aliʻi burial area.

The presence of Pihanakalani, a large heiau (temple) near the shore and along ʻIao Stream, denotes the religious significance of ʻIao.

The Battle of Keaniwai – Uniting the Islands

In the late 1780s, Kamehameha I from the island of Hawai’i began waging battles to unite all the islands under his rule. In 1790, he landed along Kahului Bay with a large fleet of canoes. At Wailuku, Kamekamha’s forces met the Maui forces under Kalanikupule. Kalanikupule was placed in charge while his father, ruling chief Kahekili, was living on O’ahu after defeating the Oahu forces in 1783.

This battle for Maui is said to be one of the bitterest ever fought on Hawaiian soil. As the warriors reached ‘Iao, their shouts of defiance echoed throughout the valley.

Iao Valley Ridges

Women and children on the mountainsides were witnesses to the clashing of wooden spears, the firing of muskets, and the roar of the cannon. There were so many slain from both armies that their bodies clogged the stream. Thus, the battle was named Kepaniwai, or “Damming of the waters.”

The guns and the cannon were the winning advantages for Kamehameha. But he and Kalanikupule were destined to meet again in the battle of Nuʻuanu Pali on Oʻahu. With Kamehameha’s defeat of the forces on Maui and Oʻahu and an agreement with Kauaʻi, he became the first moʻi (king) of the Hawaiian Islands.

Ancient Hawaii Geologic History

Stage 1 – Eruption

A shield volcano forms the foundation of the West Maui Mountains. For a million years, molten rock (Liquid Magma) fountains into the air and runs down the sides of the growing

Stage 2 – Caldera

The loss of magma from the summit results in a collapse that forms a caldera. Erosion begins with the formation of gullies on the flanks of the volcano.

Stage 3 – Erosion

Hot, steamy gases continue to rise and soften the rock long after the lava flow ceases. Rain collects near the former summit, and ‘Iao Stream gradually cuts through the softened rock.

Iao Valley Water Rocks

Stage 4 – Wailuku Plain

As erosion continues, an amphitheater valley is sculpted. Smaller streams erode side gulches and enlarge the valley. The deposited rock and soil at the mouth of the valley add to the Wailuku Plain.

Stage 5 – Stabilization

As plants carpet the surface, they stabilize the valley walls and floor. But what began as a native Hawaiian forest has become a landscape dominated by alien vegetation.

Iao Valley Plant Blanket

Iao Valley Visitor Tips

An enchanting area for Maui visitors and locals alike, Iao Valley has endless opportunities to capture the perfect photo, connect with nature, and learn more about Hawaii’s culture, history, and spiritual relationship with the outdoors. While visitors are welcome to explore the area on their own, a guided Haleakala Maui Tour offers deeper insight into the importance of the area, as well as the nearby Kepaniwai Park & Heritage Gardens, established in the 1950s to showcase Maui’s vast ethnic heritage.

Iao Valley Visitor Area

Guests of this memorable guided tour are also treated to a driving tour of Haleakala Volcano and views from the summit, in addition to an Upcountry picnic and a visit to the area’s eucalyptus forest and notable ranches. Call (808) 495-8875 for more information or to make a booking for your Maui trip.

The Sites of Iao

The trails of the park are paved but may be slippery when wet. The trail is steep in places, so take your time. Along the rail are several stops you may want to make but stay on the designated walkways.

Kahawai (stream)

Iao Valley Streams

Swimming in Iao Stream is not recommended. The rocks are very slippery, and the water flows quickly. Caution: Flash floods can occur without warning.

Malama i keia wahi

Care for this sacred place and show respect as you visit this special area.

Iao Valley Show Respect

**We’d like to thank Iao Valley State Park for all of the great information above.


ʻIao Valley Map