Manjanggul Cave

 MANJANGCAVE, SITUATED 30 KILOMETERS EAST OF CHEJU CITY AT TONGKIMNYONG-RI KUJWAUP. PUKCHEJU-gUN, WAS designated as Natural Monument No. 98 on March 28, 1970. this 13,422-meter lava-tuve has been officially accepted as the longest lave-tube system in the world. Annual temperatures inside the tube range from 11กษ to 21กษ, making it agreeable through out the year. Rainsecte species are valuable research materials. "The lava turtle", :The lava pillar", and "Wing-shaped Wall" are fast becoming worldwide tourist attractions.