Jeju Island

Jeju is South Korea's largest island and its most geologically dramatic — a volcanic shield rising out of the Korea Strait, with Hallasan at its centre, lava tube caves running beneath its surface, and a coastline of black basalt cliffs dropping into clear water. It was formed by a series of volcanic eruptions and the evidence is everywhere: in the crater lakes at the summit of Hallasan, in the Manjanggul lava tube that stretches for over 8 kilometres underground, and in the columns of basalt that line the southern coast at Jusangjeolli. It is a UNESCO World Natural Heritage Site three times over, which is unusual enough to be worth noting.

Beyond the geology, Jeju moves at a pace that's noticeably slower than the mainland. The island has its own dialect, its own food culture — black pork, abalone, hallabong citrus — and a tradition of haenyeo, the free-diving women who have harvested seafood from the coastal waters for centuries. Halal-certified restaurants are available in Jeju City and are expanding as Muslim visitor numbers grow; it is worth checking current options before travel. Most of the island's highlights require a car or organised transport — public buses reach the main sites but add significant time to each journey.

Three to four days is the right amount of time for Jeju — enough to cover the volcanic highlights, spend time on the coast, and eat properly without rushing. Flights from Seoul take about an hour; it is one of the world's busiest air routes and tickets are straightforward to find. Jeju suits travellers who want natural landscapes with enough infrastructure to be comfortable, and enough cultural distinctiveness to feel genuinely different from the mainland.