Tsushima is part of Nagasaki Prefecture, a province on the southwest shores of mainland Japan. Tsushima is out into the Sea of Japan about half way to South Korea. The island of Iki is inland from Tsushima and also offers some great, unique dive sites in Japan. Scuba diving off Tsushima is a new phenomenon and it is worth pursuing. However, be aware that there are a few dive shops. Tsushima is less oriented towards the western scuba divers than around Okinawa or Tokyo.
Tsushima Airport on the east central coast of the island of Tsushima is accessible via short 35-minute hop flights from Fukuoka and Nagasaki airports. Tsushima airport is just north of the city of Tsushima offering tourists easy access to the dive sites and resorts along the coast.
Once in Tsushima you can find some dive shops and resorts that have sprung up on the island in the last decade or so that cater to water sports. Jou Jou Scuba Dive Service in the port town of Izuhara, not far from the city of Tsushima, offers some English speaking instruction and boat tours to the islands east coast dive sites.
The coldest reef in the world, Tsushima reef is located off the Tsushima Bay towards Iki Island. The primary dive shop of the island, Jou Jou Scuba Dive Service takes experienced divers out to see the reef first hand. Mar Scuba out of Tokyo is a large dive shop that can possibly take divers on custom excursions to both Tsushima and Iki cold-water reefs upon request.
For those who prefer overseas transportation, there is a ferry to Tsushima from the port city of Shimonoseki on the main island of Honshu. For those traveling from Korea there is a high-speed ferry service from South Korea's second largest city of Busan. There are also ferries to and from Iki Island and Tsushima.
Today (18 May) I had a very bad experience with your company, agency Sunrise Tours I did the 'morning tour' in Tokyo with Kumie guide, car 11. The first stop was the Tokyo Tower, where there is no time to contemplate the view. Kumie did not use microphone and the group were large. Impossible all to hear it. She promissed free time. But that is not true, the time was exactly to run all over the place, we cannot stop. The guide also did not ask if somebody had questions and let us no time to...