Jeju in 2010s: Chinese and Korean weekenders

Wow factor is high for a temperate-to-subtropical island, a step below the equatorial places in this atlas. Seasonality is high: winter winds and a short warm-water window. Accessibility is middling-high: domestic flights and a few shore snorkels, plus boat dives that wait on swell. Risk is moderate: current, cold, and boat traffic, not wreck-penetration scores.

This chapter is a place atlas, not a haenyeo costume, not a certifying agency, and not a live briefing. Jeju marine park rules, the day's wind and a working dive-ground override any sentence here. Destination pages are season and access notes — not a booking engine. Visa, park fees and live weather beat brochure months.

Pick the matching craft page (snorkel/scuba/surf) before the flight. Jeju mapped for mechanisms, locale notes and limits. Jeju sits in the places atlas — mechanisms, locale notes and limits, not slogans. Adoption and meaning follow coastal and inland water sites as much as peak specs.