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Floating just 30 to 40 kilometers west of Naha, the Kerama Islands (Kerama Shoto) look like an untouched tropical postcard. Their waters are so crystalline, and their gradients of turquoise and deep indigo so striking, that Japanese oceanographers coined a dedicated term for this luminous palette: the "Kerama Blue".
Designated as a Japanese National Park in 2014, this archipelago encompasses thriving coral gardens, hundreds of colorful reef fish species, and one of the highest coastal concentrations of green and hawksbill sea turtles in East Asia. During winter, the surrounding straits serve as the primary mating and calving sanctuary for North Pacific humpback whales.
On paper, taking a ferry from Naha to the Keramas is the quintessential island day trip. Yet without realistic preparation, your dream excursion can quickly run into logistical roadblocks: sold-out ferries, crowded shuttle vans, and rows of paid umbrellas lining the sand.
As an Okinawa resident since 2018 who navigates these waters throughout all seasons, here is my honest, transparent guide to visiting Tokashiki, Zamami, and Aka: how to choose the right island, master the 60-day ferry booking window, and experience the pure magic of the Kerama Blue on your own terms.
Between late April and mid-October, the Kerama Islands experience immense tourist pressure. Most overseas travel itineraries and cruise line day-trippers funnel thousands of visitors into the exact same ferry terminal at Tomarin (Naha), bound for the exact same two beaches: Furuzamami (Zamami) and Aharen (Tokashiki).
- High-speed ferries sell out weeks in advance: Without booking right when ticket windows open 60 days before travel, you will be stuck at the dock.
- Packed shorelines: The first 100 meters of sand on primary beaches feature densely packed rental parasols, noisy water taxi engines, and crowded swimming zones.
- Lodging shortage: Family-run guesthouses (minshuku) fill up 3 to 4 months in advance during July and August, pushing prices up significantly.
Island Comparison: Which Kerama Island Fits Your Style?
The archipelago consists of over 20 islands and islets, but only four are inhabited: Tokashiki, Zamami, Aka, and tiny Geruma (connected to Aka by a scenic bridge). For a first trip, your choice will center on one of the three primary destinations:
| Feature | 🏝️ Tokashiki Island | 🐢 Zamami Island | 🦌 Aka Island |
|---|---|---|---|
| Island Profile | Largest island with dramatic, mountainous coastal terrain | Balanced island with charming village and vibrant cafe scene | Most peaceful, wild and authentic outpost |
| Fast Ferry from Naha | 35 minutes (Marine Liner) | 50 minutes (Queen Zamami) | 50 minutes (Queen Zamami) |
| Signature Beach | Aharen Beach (electric blue bay) | Furuzamami (Michelin green star reef) | Nishibama Beach (superb reef life) |
| Sea Turtle Snorkel | Tokashiku Beach (quiet, sheltered cove) | Ama Beach (turtles graze at high tide) | Aka Port beach & Mae-hama reef |
| Wildlife & Nature | Sweeping cliffside panoramic viewpoints | Humpback whale lookouts (Takatsukiyama) | Wild Kerama Deer (protected monument) |
| Best For | Day trippers looking for fast transit and big views | Snorkelers, turtle lovers, and active village vibes | Nature lovers seeking quiet, crowd-free waters |
Ferry Logistics: Mastering the 60-Day Booking Window
Every passenger ferry to the Kerama Islands departs from Tomari Port (located within the multi-story Tomarin building) in downtown Naha. Because the Kerama Islands are governed by two distinct local municipalities, they operate separate booking platforms and terminals:
To Zamami & Aka Islands
Operated by the Zamami Village Office. High-speed boat Queen Zamami stops first at Aka Island (50 min) then continues to Zamami Island (10 min further).
- Queen Zamami (Fast boat): ~50 minutes | ~3,200 JPY one-way.
- Ferry Zamami (Standard ferry): ~90 to 120 minutes | ~2,150 JPY one-way.
- Reservation Window: Exactly 2 months in advance at 0:00 JST online.
To Tokashiki Island
Operated by the Tokashiki Village Office. The fastest island to reach from Naha, arriving at Tokashiki Port on the northeast coast.
- Marine Liner Tokashiki (Fast boat): ~35 minutes | ~2,530 JPY one-way.
- Ferry Tokashiki (Standard ferry): ~70 minutes | ~1,690 JPY one-way.
- Environmental Tax: +100 JPY Kerama Islands Eco Tax collected on ticket.
Snorkeling & Sea Turtles: Where and When to Go
Swimming side-by-side with wild sea turtles in transparent water is the highlight of any Kerama excursion. However, turtles do not stay on the sand: they visit specific shallow coastal feeding zones according to the tide table.
The premier location for shore-entry turtle encounters. Green sea turtles move into the shallow bay to graze on marine eelgrass beds.
A serene crescent bay sheltered between green headlands. Far quieter than neighboring Aharen Beach, with resident turtles frequenting the sandy seafloor.
1. Keep a 3-meter safety bubble: Never touch, grab, ride, or circle a sea turtle.
2. Clear surface access: Always allow sea turtles an open, unblocked path to the surface to breathe air.
3. Reef-safe sunscreen only: Use zinc/titanium dioxide physical barrier sunscreen to prevent coral reef bleaching.
4. No fin-standing: Never stand on live coral colonies; tread water or use a flotation vest.
Due to typhoon swells or sudden sea condition shifts, passenger ferries can be suspended with very short notice. If tickets are unavailable or boats are grounded, do not stay stranded in Naha:
Drive across free bridges to Sesoko Island, Kouri Island, or the eastern Kaichu-Doro chain (Hamahiga, Ikei) for magnificent lagoons with zero ferry risks.
Depart from Motobu Port in the north for a calm, 30-minute crossing to volcanic Ie-jima, rarely impacted by open-ocean swell.
Explore the UNESCO Yanbaru rainforest, hidden ocean lookouts, and ancient Ryukyu castles with resident private guide Arnaud.
Frequently Asked Questions About the Kerama Islands
Which Kerama island should I choose: Tokashiki, Zamami, or Aka?
Choose Tokashiki for sweeping elevated vistas, dramatic turquoise waters at Aharen Beach, and an easy, low-stress day trip. Pick Zamami for a friendly village atmosphere, vibrant coral drop-offs at Furuzamami, and swimming with wild sea turtles at Ama Beach. Choose Aka for absolute tranquility, pristine coral gardens, and wild Kerama deer roaming free away from tourist crowds.
How do I book the ferry to the Kerama Islands from Naha?
All passenger ferries depart from Tomari Port (Tomarin building) in downtown Naha. Reservations open exactly two calendar months in advance on the official municipal booking portals (Zamami Village and Tokashiki Village). For high-speed boats (Queen Zamami and Marine Liner Tokashiki), booking as soon as the window opens is vital between April and October, as tickets sell out weeks in advance.
Can I visit the Kerama Islands as a single day trip from Naha?
Yes, a day trip is very common thanks to high-speed passenger ferries: 35 minutes to Tokashiki and 50 minutes to Zamami or Aka. Travelers depart around 9:00 AM from Naha and return on the 4:30 PM or 5:00 PM ferry. Be mindful of tropical sun exposure and high-season crowds.
Where can I swim with sea turtles in the Keramas?
The top two shore-accessible spots are Ama Beach on Zamami Island (green sea turtles graze on shallow sea grass at high tide) and Tokashiku Beach on Tokashiki Island. Always keep a respectful distance of at least 2 to 3 meters and never touch or chase the turtles.
What should I do if the Kerama ferries are completely booked or cancelled?
If ferries are fully booked or cancelled due to rough sea swells, do not let your day go to waste. Rent a car or book a private tour on Okinawa Main Island to explore the gorgeous toll-free bridge-connected islands in the North and East (Sesoko, Kouri, Hamahiga, Ikei), or take the sheltered 30-minute car ferry to Ie Island from Motobu Port.
Explore Okinawa Beyond the Crowds with Arnaud
Based in Nago, I craft bespoke private tours and custom itineraries across Okinawa Main Island and neighboring archipelagos. Whether you want to trek deep inside UNESCO Yanbaru ancient forests or experience historic Ryukyu royal culture without the bus tours, let us plan your journey.