Jeju province encompasses the South Korean island of Jeju in the Korea Strait.
It's known for its beach resorts and volcanic landscape of craters and cavelike lava tubes.
Hallasan Mountain, a dormant volcano, features hiking trails, a crater lake at the 1,950m summit and nearby Gwaneumsa Temple.
The Geomunoreum Lava Tube System includes 7km-long Manjanggul Cave, created centuries ago when Hallasan was still active.
Area: 1,849 km²
Population: 604,771 (Oct 2014)