Two names, two different walks
In Gasi-ri, Pyoseon-myeon, Seogwipo, Ttarabi Oreum and Keunsaseumi Oreum (Daeroksan) offer different ways to experience Jeju's autumn landscapes. They are not one summit or one shared entrance, even if they look close on a map.
Ttarabi: curved crater ridges
Visit Jeju describes Ttarabi Oreum as a volcanic hill with three craters (called *gumburi* in Jeju) and six peaks. Its soft ridgelines overlook silver grass, Daeroksan and distant wind turbines. The official listing gives approximately 20 minutes one way, or around 1–1.5 hours round trip when walking the crater paths. Those figures are estimates, not confirmed travel times for your conditions. It also states that toilets are not available. Decide whether you want a short summit visit or a fuller ridge walk.
Daeroksan: a grassy approach with steps
Keunsaseumi Oreum, also called Daeroksan, is a roughly 466 m volcanic cone. Jeju Tourism Organization's Kareumstay listing describes broad silver-grass fields and roughly 1.3 km from the grass field to the summit, with a fair number of steps. This distance describes one section, not a whole circuit or a round-trip time. Comfortable footwear and weather checks matter.
The 10.3 km route is another kind of plan
The official tourism feature describes the old horse-grazing heritage route, Gapmajang Trail, as 20 km in total. Its shorter Jjolbeun Gapmajang section measures 10.3 km and includes both oreums. Visiting one hill is not the same as completing this longer hike. Decide in advance whether you intend to drive between places or walk the full heritage route; do not assume an unverified transfer time.
Check the entrance, not just the parcel number
Visit Jeju's main attraction pages list Ttarabi at Gasi-ri *san* 62 and Daeroksan at *san* 68, while its Kareumstay pages use *san* 63 and *san* 68-3. These are mountain land-parcel numbers and may not be the entrances or parking locations. Visit Jeju warns that navigation to some oreums may be inaccurate and some trails may be restricted. Contact the Jeju Tourism Information Center (+82-64-740-6000), check current access, weather, daylight, parking, toilets and pet rules before visiting.
Neither trail opening nor real-time silver-grass conditions has been independently confirmed for today.