The "Seoul 10". Climb these 10 well-known peaks surrounding the megapolis of Seoul. Within easy access of 10 million people, don't expect to be alone on most of these peaks. Based on the "Seoul 7 Peak Hiking Challenge" created by the Seoul Tourism Organization (STO) in 2023 (in that challenge, participants picked 7 out of these 10 peaks). Note: since the highest peak of Cheonggyesan is off-limits, its lower peak Maebong is included instead.