Gwanaksan, Mountain peak in Gwanak District, South Korea

Gwanaksan is a mountain in the southern part of Seoul, spanning the Gwanak and Geumcheon districts as well as the nearby cities of Anyang and Gwacheon. It forms the central point of a long ridge with forested slopes and a rocky summit area.

In traditional Korean geography, Gwanaksan was counted among the five principal peaks of Gyeonggi Province, giving it a recognized place in regional identity across centuries. This standing connected the mountain to ritual and administrative traditions that shaped how the surrounding area was understood.

Yeonjuam takes its name from Yeonjudae, the cliff-top platform about 300 m above it, called "Yeomjudae" ("thinking of the ruler") in early Joseon records and later altered in speech. The temple was founded in 1396 and moved to its present site in 1411 by Prince Hyoryeong, who also sponsored a three-storey stone pagoda of Goryeo style, 4 m tall, standing before the main hall. Hyoryeong, who declined the throne and supported his brother Sejong, is credited with promoting Buddhism through such foundations.

The main trails start from Seoul National University, Gwacheon Station, and Sadang Station, and each path takes about two hours to reach the top. Sturdy footwear is important, as the rocky sections can become slippery in wet conditions.

Gwanaksan was designated as a city park in 1968, making it one of the few peaks in Seoul reachable directly by subway without long connections. Because of this, many locals use it for short outings on weekday mornings, not just on weekends.