Jeju in 4 days

A tuff cone that rose from the sea about 5,000 years ago, UNESCO-listed since 2007, its 600-metre crater ringed by rocky peaks like a crown.

A 15-minute ferry from Seongsan, then a 15 km loop by e-bike or scooter past peanut fields, volcanic stone walls and the Udobong cliff.

A 7.4 km lava tube, of which one kilometre is open on foot, up to 18 metres wide and 23 metres high in places.

A lived-in village protected since 1984, with thatched roofs roped down against the wind and three wooden poles at the gate signalling who is home.

South Korea's highest point, 1,947 metres, crowned by Baengnokdam crater; only two trails reach the top, Seongpanak, long and steady, and Gwaneumsa, shorter but steeper.

The island's oldest permanent market, opened in 1945, with hallabong tangerines, live octopus, dried mackerel and stacks of rice cakes.

A 23-metre waterfall dropping straight into the sea, rare in East Asia, reached by stone steps from Seogwipo and a walk over round pebbles.

A wall of hexagonal basalt columns along 1.75 km of coast at Jungmun, formed when lava met the sea and cracked as it cooled.