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River · Līhuʻe, Hawaii
Wailua River and Fern Grotto
The river that flows from central Kauai to the sea near Lihue, through a valley with ancient Hawaiian temples. Boats travel about 3 km upriver to the Fern Grotto, a lava cavity draped with hanging ferns.
Illustrative images. The pictures in this guide are illustrations based on the real place, not photographs, and may differ from it.
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About Wailua River and Fern Grotto
The Wailua River rises on the slopes of Mount Waiʻaleʻale and empties on Kauai’s east coast, about 10 km from Lihue toward Kapaʻa. The valley around its mouth was a political and religious center for the island’s chiefs. Today it is part of Wailua River State Park, which includes sites such as stone temples, birth rocks where chiefs’ children were born and ancient terraces.
Tour boats depart the marina near the mouth and travel about 3 km upriver between forested banks and coconut palms. Along the way, musicians and dancers perform songs and hula. The landing leads to a short trail through the forest to the Fern Grotto, an opening in a lava rock covered with hanging ferns and water dripping from the edges.
At the grotto, groups often hear a Hawaiian wedding song, and many couples choose the place for ceremonies. The round-trip tour takes about an hour and a half.
The river is also traveled by kayak, on guided tours or with rentals, along the lower stretch of the course.
Before you go
Practical information
Cidade Turismo reviews its information regularly, but something may have changed. Check with the place before planning your trip.
How much time to set aside
About an hour and a half for the boat tour to the grotto.
Best time
In the morning, when the river is usually calmer and the light enters the valley. After heavy rains, tours may be cancelled.
How to get there
The marina is at the mouth of the river, next to Highway 56, about 10 km from Lihue. The grotto can only be reached on authorized boats with paid tickets; check schedules with the operator.
Tip
Book the boat in advance, especially on days when cruise ships are in port. Bring insect repellent for the trail to the grotto.
Official website
Get your questions answered
Frequently asked questions about Wailua River and Fern Grotto
How do I get to the Fern Grotto in Kauai?
By boat, on tours that go about 3 km upriver from the Wailua River marina near the mouth, followed by a short trail.
How long is the tour to the Fern Grotto?
About an hour and a half, round trip, including time at the grotto.
Can you kayak on the Wailua River?
Yes, on the river’s lower section, with rentals or guided tours. Landing at the grotto is reserved for authorized boats.