The Kerama Islands — a cluster of about 20 islands surrounded by waters designated a National Park — sit 40 kilometers west of Naha in waters so transparently clear that marine biologists coined the term "Kerama Blue" to describe their particular shade. Visibility often exceeds 30 meters, and the coral reefs here are among the healthiest in Japan.
The Main Islands
Zamami Island (人口600人) is the largest and most visited Kerama island, with a small village, several diving operators, excellent beaches (Furuzamami Beach is spectacular), and whale watching opportunities in winter. Tokashiki Island is the largest in the group, with the famous Aharen Beach — a long, curved white sand beach with calm water perfect for swimming and snorkeling. Aka Island is the smallest main island, quieter than Zamami, with fewer facilities but equally beautiful beaches and sea.
Marine Life
The Kerama Islands' coral reefs host extraordinary biodiversity. Humpback whales pass through the surrounding waters from January to March — Zamami operates excellent whale watching boats during this period. Sea turtles nest on several island beaches and are commonly sighted while snorkeling. The coral itself, while impacted by bleaching events in recent warm years, still contains vibrant sections with sea fans, hard corals, and hundreds of tropical fish species.
Diving
The Kerama Islands offer diving suitable for all levels. Beginners find gentle, shallow reefs with excellent visibility and friendly staff at Zamami's multiple dive shops (around ¥8,000–12,000 for a two-tank dive with equipment). Experienced divers seek out specific sites: the walls and crevices around Aka and Geruma islands, the challenging currents that bring pelagic fish, and the historic WWII wrecks in the area.
Getting There
High-speed ferries from Naha's Tomari Port reach Zamami in 50 minutes (¥3,140 one way) or Tokashiki in 35 minutes (¥1,690). Slower car ferries take about 2 hours but are cheaper. Ferry schedules vary by season with more frequent service in summer. Day trips from Naha are possible, though staying overnight on an island allows for peaceful evenings and early-morning beach access before day-trippers arrive.
Accommodation
Zamami and Tokashiki both have minshuku (Japanese guesthouses), small hotels, and some rental cottages. Accommodation is simple — these are fishing villages, not resort destinations — but immaculate and welcoming. Meals often feature Okinawan home cooking using local fish and vegetables. Booking well in advance is essential for summer (July–August) when the islands are popular with domestic tourists.
