Mermaid Caves on Oahu

The Mermaid Caves are on the western side of Oahu near Nanakuli Beach. Parking is available at this and other beach parks in the area. The caves are a feature within the lava rock shore, so make sure you have shoes that can handle the wet, rocky terrain.

Use Caution

Any kids visiting the mermaid caves should probably be at least 10 years old. I want to call out early that while this is an amazing destination, it does require some planning. Natural forces that formed this attraction are still present and can be precarious.

This is a great destination that most should be able to handle if they’re over about 10 years, decent swimmers, and have the necessary footwear to walk across the rocks.

These caves do fill up with water when the tide or swell is high, so be prepared to not enter if ocean water is high or rising.

Positively Gorgeous

The caves a spectacularly gorgeous. I’m convinced the reason they aren’t in a movie is it would be difficult to get cameras in and time filming with the tides.

Mermaid Caves is an absolutely fitting name. The light rays filtered through the rock ceiling shine deep into the glorious blue pools.

The pools themselves are deep and the hidden beach awakens both wonder and a sense of being on your own adventure.

Beach Hidden under Lava rock

The Mermaid Caves were formed by ocean water waves eroding the side of the rock cliffs and leaving an overhanging ceiling. Once deep enough under the rock, a sand beach was formed.

The beach is secret for a few reasons.

The caves will only fit a few swimmers at a time. This area could quite easily become too crowded.

Additionally, it does take some work to get there — most anyone could, but you’re going to want to have the right gear.

Once you drop through the hole in the roof the waves are lapping at the beach underneath the rock.

Travel To the Mermaid Caves

Very easy to get to this area Oahu. Arriving on the local bus would also be an option.

Driving

The Mermaid Caves are on the West Side of Oahu, which tends to get less traffic than many other locations on the Island. Take the H1 Freeway around Pearl Harbor and continue toward Ewa Beach – eventually, this turns into Highway 93. Take the highway to Nanakuli Beach Park or any of the other beaches in the area.

There aren’t any turns until you get to the parking lot.

Parking

Since this side of the island is less crowded, you should have no problem parking in the lots dedicated to the local beaches.

Walking to the Caves

You should be able to drop a pin on a maps-app exactly where the caves are, and have the app lead you correctly. I never leave my phone in the car, so I’d recommend taking yours even if you know exactly where to go (Pro Tip: Have a waterproof bag for your phone.)

From the parking lot of Nanakul Beach take the sidewalk towards the ocean and once you get to the lava rock cliffs turn right and begin walking on the cliffs themselves. Make sure you have appropriate shoes for this portion.

The mermaid caves are about even with the second home lot.

H2  FAQ

Are the Mermaid Caves Safe?

Caution is warranted. It’s a good idea to know when the tides are going to be going out and time your visit around that. Also, any children should be at least 10 to 12 years old and anyone entering the caves should be a competent swimmer.

Knowing when the tides will be going out can help you plan the timing of your visit. Additionally, anyone entering the caves should be a proficient swimmer and any minors should be between the ages of 10 and 12.

How were the Caves Made?

They were created by the forces of erosion they are the waves tunneled under the tall lava-rock cliffs. At some point, this rock roof will likely crumble, but that does not seem imminent.

Why are the Caves Secret?

Many reasons. The real answer is they aren’t published, but not necessarily secret.

The caves aren’t advertised since there isn’t a business tied to them. Many natural landmarks in Hawaii are equally secret and social media is exposing those locations to more explorers.

Also, since caution is warranted, there are plenty of families that skip this attraction.

Is there a Ladder into the Mermaid Caves?

Sometimes there is a ladder placed here, but nobody can guarantee there will be one on any given day. Before entering the cave, you should make sure you’ll be comfortable climbing back out.

Cautions

Be cautious here! Knowing when the tides will be going out can help you plan the timing of your visit. Additionally, anyone entering the caves should be a proficient swimmer and any minors should be between the ages of 10 and 12.

Summary & Nearby Attractions

The Mermaid Caves are gorgeous. As long as conditions allow and your entire party feels up to the task, I definitely recommend a visit.

The lighting inside is majestic. You feel like you’re in a movie automatically beginning an adventure.

As long as everyone is capable of handling them, the Mermaid Caves will be a memorable visit for everyone.

Nearby Attractions

On the western side of Oahu there are many other things to see and do. I’ve seen whales and dolphins over here. Depending on the time of year, the beaches may be calmer over here than on other sides of the island. Since you’re already likely in swimming attire, I’d recommend spending a few hours at one of the beaches over here.

The town of Maili is a little further along Highway 93 – from there to the end of the highway are many lookouts and beaches to see an incredible sunset.

You can take an easy hike to the Maili Pillbox or visit the Wainae Harbor.

After the caves, if you’re hungry, check out Spinners Cafe, the Spice House, or grab shave ice at Dan’s Maile Shave Ice.