The Kerama Islands — a cluster of islands 40 km west of Naha accessible by high-speed ferry in 35–70 minutes — are among Okinawa Prefecture’s most stunning destinations. Designated a National Park in 2014, the Keramas are famous for “Kerama Blue” — a water color of extraordinary clarity and intensity — and for one of Japan’s most reliable humpback whale watching seasons from January through March.
The Three Main Islands
Zamami Island is the largest and most developed Kerama island, with ferry service from Naha (65 minutes on the slower Queen Zamami, 35 minutes on high-speed boat). The island’s Furuzamami Beach — a 300-meter arc of white sand with forest backdrop and calm, impossibly blue water — is consistently rated among Japan’s top beaches. A coral reef begins immediately at the beach edge, making snorkeling accessible without a boat. The island has several minshuku, one small hotel, rental bicycles, and a handful of restaurants. Aka Island, 10 minutes by boat from Zamami, has Nishibama Beach — another spectacular white-sand beach often cited as Okinawa’s finest for snorkeling. The Aka and Zamami island communities have famously loyal resident dogs who are said to swim between the islands to visit mates — the “Marilyn and Shiro” story has become local legend. Tokashiki Island, the largest Kerama island, has two large beaches (Tokashiku and Aharen) on the western coast and receives most of the day-trip boat tours from Naha.
Humpback Whale Watching
The Kerama area is one of Japan’s best whale watching locations — humpback whales migrate to the warm Okinawan waters from January through March to breed and calve. Whale watching boat tours depart from Zamami, Aka, and Naha ports during this season, typically running 2–3 hours. Encounters with breaching, tail-slapping, or surface-active whales are common; the warm, clear water means underwater snorkeling encounters are occasionally possible. Multiple operators offer tours from Naha (¥6,000–8,000 per person). The Zamami Whale Watching Association tracks whale positions and directs boats — encounter rates are typically high in peak season (February–March).
Kerama Diving
The Kerama Islands are widely considered Okinawa’s finest diving, with visibility frequently exceeding 40 meters and an intact coral ecosystem. Unajai Cave near Zamami is a shallow cavern dive with light-play effects. Winter diving (December–March) offers the unusual combination of whale songs audible underwater and sea turtles (green and hawksbill turtles nest on Kerama beaches and are regularly encountered on dives year-round). Dive shops on Zamami and Tokashiki offer full rental equipment; operators accept all certification levels and non-certified snorkelers. Coral bleaching events have affected some Kerama reefs — conditions vary by season and location; ask dive operators about current reef health before booking.
Logistics: Day Trip vs. Overnight
The Keramas can be visited as a day trip from Naha — ferries run morning and evening, leaving 4–6 hours on island. However, overnight stays are far superior: the beaches are nearly deserted after the day-trip boats leave, stars are exceptional without city light pollution, and the pace slows to something genuinely restful. Ferry booking is essential during Golden Week (late April–early May) and summer — reserve both ferry and accommodation well in advance. The Marine Liner Tokashiki and Queen Zamami ferries depart from Naha Tomari Port (30 minutes from Naha Airport by taxi). The high-speed boats are significantly faster but more susceptible to cancellation in rough weather — check forecasts if combining with tight onward connections.
Practical Notes
Zamami and Aka islands have limited but good accommodation — traditional minshuku serve home-cooked Okinawan meals including goya champuru, rafute pork, and sea grapes (umibudo). Rental bicycles and scooters allow full island exploration. The islands have no convenience stores — bring any specific snacks or medicines from Naha. Jellyfish nets are in place at main beaches from May through October; check with the local tourism office before swimming outside netted areas. The Kerama National Park status means fishing and collecting are strictly regulated — spearfishing and coral collection are prohibited for visitors.