Yakushima - Isso Beach

Miyanoura · Kagoshima Prefecture · Japan

Yakushima is a mystical island lying off the southern tip of Kyushu in Kagoshima Prefecture, equally famous for its ancient cedar forests and its remarkable sea turtle population. Isso Beach, on the island's northern coast, serves as both a critical loggerhead turtle nesting ground and a gateway to some of the most reliable sea turtle diving in Japan. The Kuroshio Current bathes the island in warm, nutrient-rich water that supports a vibrant subtropical ecosystem. Diving at Isso Beach begins with a straightforward shore entry over a sandy bottom that slopes gently to rocky reef formations at depth. The reef supports healthy hard corals, sea fans, and barrel sponges that attract a colourful array of tropical and temperate fish species. But the true draw is the turtles. Green sea turtles are present year-round, grazing on seagrass beds and resting under coral overhangs. From May through August, loggerhead turtles arrive to nest on Isso's sandy beach, and encountering them both on land in the evening and underwater during the day is a profoundly moving experience. The encounter rate during diving season exceeds 90 percent. Beyond the turtles, the Kuroshio Current delivers impressive pelagic visitors. Spotted eagle rays sweep over the reef, schools of giant trevallies and bluefin trevallies hunt along the drop-off, and yellowtail amberjack appear in large schools during spring and autumn. Barracuda patrols are common, and lucky divers may spot dogtooth tuna cruising in the blue. The macro life is also noteworthy, with various nudibranch species, moray eels, and anemone gardens hosting multiple clownfish species. Yakushima's appeal extends far beyond the ocean. As a UNESCO World Heritage Site, the island's interior harbours primeval cedar forests with trees exceeding 2,000 years of age, moss-draped ravines, and mountain peaks reaching nearly 2,000 metres. Most divers combine underwater exploration with forest trekking, creating a uniquely holistic nature experience. The island is accessible by air from Kagoshima and Osaka, or by high-speed ferry from Kagoshima, making it a manageable addition to any Japan diving itinerary.