Hilltop view of Jeju farmland with Hallasan and Sanbangsan

Jeju Island has an oval shape and is 73 km (45 mi) east-west and 31 km (19 mi) north-south, with a gentle slope around Hallasan in the center. The length of the main road is 181 km (112 mi) and the coastline is 258 km (160 mi). On the northern end of Jeju Island is Gimnyeong Beach, on the southern end Songak Mountain, the western end Suwol Peak, and the eastern end Seongsan Ilchulbong.

Illustrated map of Jeju Olle Trail's 27 numbered routes

The Jeju Olle Trail (Korean: 제주올레길) is a long-distance footpath on Jeju Island, in Jeju Province, South Korea. The trail consists of 21 connected numbered main routes, 6 sub-routes, and a short spur that connects to Jeju International Airport. On average, the routes are 16 km in length and total 437 km. They mainly follow Jeju’s coastline and around its outlying islands, passing beaches, fishing villages, indigenous forest, tourist destinations, and urban centers. The exact length and locations change over time as trails are modified or re-routed. Jeju Olle Trail was envisioned and developed by former journalist Suh Myung-sook. It is named after olle (올레), which are short alleys connecting houses to main walkways in traditional Jeju folk architecture.