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Overview
The Kerama Islands (慶良間諸島) are a group of roughly 20 islands and numerous islets located about 30–40 km west of Naha, the capital of Okinawa Prefecture. Designated as Keramashoto National Park in March 2014, they form one of Japan's most ecologically significant marine protected areas.
The island chain is best known for the exceptional water clarity — a phenomenon locals call Kerama Blue — which makes it one of Asia's premier diving and snorkeling destinations. The reefs host a diverse array of hard and soft corals, sea turtles, manta rays, and hundreds of fish species. In winter, humpback whales migrate through the surrounding waters.
The main inhabited islands are Zamami, Aka, Geruma, and Tokashiki. Each has a distinct character: Zamami is the most developed for tourism; Tokashiki is the largest and the closest to Naha; Aka is quieter, with a small resident population and easy access to nearby Nishibama Beach. Population across all islands is small — well under 2,000 residents combined — so visitors should set expectations accordingly. Facilities are modest, which is part of the appeal.
The islands sit within the Ryukyu Archipelago and carry a cultural identity shaped by Okinawan traditions, maritime history, and a long relationship with the ocean. Visitors who come expecting resort infrastructure will need to recalibrate; those who come for the sea, quiet coastlines, and unhurried pace will find something genuinely special.
Before You Go
Visas
Japan operates a visa system that varies by nationality and purpose of visit. For specific entry requirements, check TravelerPulse's Visas section and verify current rules with Japan's Ministry of Foreign Affairs (mofa.go.jp) or your nearest Japanese embassy or consulate.
When to Go
- March–June: Best overall conditions — water is warming, visibility is excellent, typhoon season has not yet begun, and crowds remain manageable.
- July–August: Peak Japanese domestic tourism season; ferries and accommodations book up quickly and should be reserved well in advance.
- January–March: Whale-watching season; seas can be rough, but the reward of seeing humpback whales is significant.
- September–November: Typhoon risk is real through October; always monitor weather forecasts and plan for possible ferry cancellations.
- December–February: Quietest period; some guesthouses and restaurants close or reduce hours. Verify accommodation availability before booking.
Health and Practical Prep
- No special vaccinations are required for Japan, but keep routine immunizations up to date.
- Travel insurance that covers dive-related medical treatment and evacuation is strongly recommended for divers.
- Medical facilities on the islands are very limited. Serious emergencies require evacuation to Naha. Stock any prescription medications and basic first-aid supplies before departing the mainland.
- Sunscreen: many dive operators and the national park encourage use of reef-safe (non-oxybenzone) sunscreen. Confirm locally what is recommended or required.
Getting There
From Naha (Okinawa mainland)
The primary access point is Tomari Port in Naha, which operates high-speed ferry services to Zamami Island and Tokashiki Island. Journey times vary by vessel type — high-speed boats can reach Zamami in approximately 50 minutes, while slower car ferries take roughly 2 hours. Schedules and fares change seasonally; verify current timetables with ferry operators (Zamami Village Ferry and Tokashiki Village Ferry operate respective routes) before traveling.
By Air
There is a small airstrip on Zamami Island. Historically small propeller aircraft have connected it to Naha, but service availability and frequency can be limited and seasonal. Check with local aviation operators for current status before relying on this option.
Booking Ahead
During the July–August peak and Golden Week (late April to early May), ferries fill up. Reservations should be made as far in advance as possible. Ferry operators typically have Japanese-language websites; staff at Naha's tourist information centers can assist with bookings.
Getting to Naha First
Naha Airport (OKA) is well connected to major Japanese cities (Tokyo, Osaka, Fukuoka) and has some international routes. From the airport, Tomari Port is reachable by monorail to Miebashi Station followed by a short walk or taxi.
Getting Around
Between Islands
Small inter-island ferries and boats connect the main inhabited islands — notably a short service between Zamami and Aka. Schedules are limited and weather-dependent; verify locally on arrival.
On Each Island
The islands are small enough that bicycles are the most practical and popular way to get around. Rental shops operate near ferry ports on the main islands, typically offering standard and electric-assist bicycles. Verify rental availability and rates locally.
Scooter and car rentals are available on some islands, particularly Tokashiki, which is larger. Given narrow, hilly roads and limited parking near beaches, bicycles or walking often remain the most efficient choice.
Taxi services exist on some islands but are very limited in number. Walking between ferry ports and nearby beaches is often feasible.
Diving and Snorkeling Transport
Most dive shops and tour operators offer boat-based excursions that serve as effective transportation to offshore reefs and snorkel spots. Booking directly with operators on arrival or in advance is the standard approach.
Where to Stay
Accommodation on the Keramas is dominated by small family-run guesthouses (民宿, minshuku) and a small number of simple hotels and inns. There are no large resort chains operating on these islands. Rooms are generally clean and functional; amenities are basic by international hotel standards.
Many guesthouses offer meals (breakfast and dinner) as part of a package, which is practical given the limited number of independent restaurants, especially in off-peak months. When booking, confirm whether meals are included and what dietary accommodations can be made.
Zamami Island has the widest selection of accommodation. Tokashiki offers options including some that cater to divers. Aka Island has very few places to stay; book well in advance if this is your preferred base.
During July, August, and major Japanese holiday periods (Golden Week, Obon), accommodation fills rapidly. Reservations made months in advance are not excessive. Many guesthouses prefer or require contact in Japanese; Naha tourist information centers or online booking platforms aggregating Okinawan accommodation can assist. Verify cancellation policies carefully, particularly given the risk of ferry cancellations due to weather.
Things to See & Do
Diving
The Keramas are consistently rated among Japan's best diving destinations and rank highly across Asia. The clarity and color of the water, strong coral health, and diverse marine life — including sea turtles, which are reliably encountered at multiple sites — make it exceptional. Numerous licensed dive shops operate on Zamami and Tokashiki, catering to all certification levels. Introductory dives for non-certified visitors are commonly available. Verify operator credentials, current pricing, and availability directly with shops.
Snorkeling
Several beaches offer excellent snorkeling directly from shore without a boat. Furuzamami Beach on Zamami and Nishibama Beach on Aka are frequently cited as standout spots. Sea turtles are often visible in shallow water at certain sites. All snorkel gear can be rented locally.
Whale Watching
Humpback whales pass through the waters around the Keramas during winter months, roughly January through March. Licensed whale-watching boat tours depart from Zamami and occasionally other islands during this period. This is a genuine wildlife encounter — sightings are not guaranteed but are frequent during peak migration.
Beaches and Hiking
Even outside the water, the islands have appeal. Furuzamami, Ama Beach, and Nishibama are among the most visited beaches. Hiking trails on Zamami offer elevated viewpoints over the island chain. Trails vary in difficulty; bring water, sun protection, and appropriate footwear.
Wildlife Beyond the Sea
- Kerama deer (Cervus nippon keramae), a subspecies endemic to the islands, can occasionally be spotted on Yakabi and other smaller islets.
- Sea turtle nesting sites are present on several beaches; signage and regulations exist to protect them. Follow posted guidelines and do not disturb nesting areas or hatchlings.
Food & Drink
What to Expect
Dining options on the Keramas are modest and limited in number. Restaurants, cafes, and guesthouses serving meals are concentrated near ferry ports on the main islands. Availability contracts significantly outside the peak summer season, and some establishments close entirely in winter. Confirming dinner arrangements with your accommodation in advance is advisable, particularly on quieter islands like Aka.
What to Eat
Okinawan cuisine forms the backbone of local menus. Dishes worth seeking out include:
- Goya champuru — stir-fry of bitter melon, tofu, egg, and pork
- Sōki soba — Okinawan noodle soup with braised pork ribs, distinct from mainland ramen
- Rafute — Okinawan-style braised pork belly
- Fresh local seafood, which varies by season and availability
- Sea grapes (umi-budō) — a local Okinawan delicacy, a type of green seaweed with a distinctive texture
Drinks
- Awamori is Okinawa's traditional distilled spirit, made from Thai rice. It is available throughout the islands.
- Beer, soft drinks, and non-alcoholic options are available at restaurants and small convenience-style shops. Stock up on provisions at Naha before departing if you have specific dietary requirements or preferences.
Practical Information
Money
Cash remains important throughout the Keramas. ATM availability is very limited on the islands. Withdraw sufficient yen in Naha before boarding the ferry. Some guesthouses and shops may not accept credit cards; confirm payment methods when booking.
Connectivity
Mobile phone coverage exists on the main islands but may be patchy in some areas. Wi-Fi is available at many guesthouses, though speeds and reliability vary. Download offline maps (Google Maps or Maps.me work well) before arriving.
Electricity
Japan uses 100V AC, 50/60 Hz, with Type A plugs (two flat parallel pins). Most devices from North America work without an adapter, though travelers from Europe, Australia, and elsewhere will need an adapter. Voltage converters may be needed for some high-wattage appliances.
Shopping and Supplies
- Small general stores near ferry ports stock basic groceries, sunscreen, snorkeling essentials, and drinks.
- Selection is limited and prices may be higher than in Naha due to transportation costs.
- Bring any specific medications, specialty foods, reef-safe sunscreen, or equipment from Naha.
Emergency Numbers
- Police in Japan: 110
- Fire and ambulance in Japan: 119
- Remember that serious medical emergencies will require evacuation to Naha. Travel insurance with evacuation coverage is strongly advised.
Respect for the National Park
- Do not touch or stand on coral reefs.
- Do not collect shells, coral, or marine life.
- Follow all posted regulations regarding sea turtle nesting areas.
- Take all rubbish with you from beaches.
Safety
The Kerama Islands are generally a safe destination. Petty crime is very rare. The principal safety considerations are environmental and related to outdoor activities.
Ocean conditions: Currents around the Keramas can be strong and change quickly. Always follow guidance from licensed dive operators and local boat captains. Do not snorkel or swim alone in unfamiliar areas. Check sea conditions before entering the water, particularly if there has been recent weather.
Typhoons: The Okinawa region experiences typhoons, primarily from June through October, with peak risk in August and September. Typhoons can cause all ferry services to suspend for multiple days. Build flexibility into your itinerary during this period. Monitor the Japan Meteorological Agency (jma.go.jp) for weather alerts.
Sun and heat: UV intensity in this subtropical latitude is high. Use sunscreen, protective clothing, and hats. Dehydration and heat exhaustion are real risks during summer months; drink water regularly.
Diving safety: Use only dive operators with verifiable credentials and equipment in good condition. Do not dive beyond your certification level. The nearest recompression chamber is in Naha — another reason dive-specific travel insurance matters.
Local Culture & Etiquette
The Kerama Islands are part of the Ryukyu cultural sphere, which has distinct traditions, language elements, and history that differ in meaningful ways from mainland Japanese culture. Okinawa was an independent kingdom — the Ryukyu Kingdom — until the late 19th century, and this heritage remains a source of local identity and pride.
The pace of island life is slow and community-oriented. Many residents are involved in fishing, tourism, or both. Visitors are generally welcomed, but respectful behavior is expected and appreciated. Greeting shop owners and guesthouse hosts with basic Japanese phrases (konnichiwa, arigatou gozaimasu) is courteous and well received even if communication then happens through translation apps.
Beaches and marine areas are treated with care by local communities, and this ethos should be shared by visitors. The protection of the national park is taken seriously. Loud or disruptive behavior, particularly near wildlife areas, is inappropriate.
Okinawan cultural expressions — including eisa drumming and dance, traditional textile arts such as bingata dyeing, and the distinctive local cuisine — are worth learning about before and during your visit. The islands themselves offer limited cultural programming, but conversations with local guesthouse owners can be a rich source of context and personal history.
