Oltis is a tea plantation on the slopes of Geomunoreum in Jocheon-eup, Jeju, where four kinds of tea are produced, from green tea to matcha, and tasting classes are held. Tasting classes run about an hour and are booked through Naver or the plantation's website, covering tea types and how to drink them. The tea fields, with Geomunoreum in the background, have a walking trail around them, and few visitors keep the grounds quiet. Teas tasted in the class can be bought online or on site.