Jejusanbangsan Tansan Oncheon is an open-air hot spring near Sanbangsan in Seogwipo. Indoors there are separate pools: an unheated carbonated spring water pool and a purified, heated pool, while the open-air pool is used with a swimsuit. Swimsuits can run short, so arrive early; women's swimsuits come in sizes 55 to 88. Only soap is provided in the pools, so bring shampoo, body wash and conditioner.