The moss growth is sustained by water naturally seeping from the surrounding rock formations and dense tree cover.
The structure was originally part of a former road expansion that utilized a concrete arched railway overpass.
The location gained prominence as a social media photography destination rather than a planned tourist attraction.
The moss cover fluctuates in density and color intensity depending on local rainfall and temperature cycles.
The Danyang Moss Tunnel is a natural phenomenon where the concrete walls of an old railway underpass have become blanketed in a lush, thick layer of moss. Originally created as part of a road development project near the railway, the constant humidity and natural runoff from the surrounding hillside allow the greenery to thrive. The tunnel structure spans approximately 200 meters, creating a distinct, vibrant green corridor that contrasts with the surrounding rural landscape. It is situated in Aegok-ri, Jeokseong-myeon, within the Danyang-gun region. The site remains a popular photography destination due to the unique aesthetic of the moss-covered walls. Visitors can observe how local environmental conditions maintain the growth throughout most of the year.
From the center of the road looking toward the tunnel exit to capture the symmetrical green walls.
Bring a tripod if you plan to take photos, as the tunnel can be dimly lit.
Visit on a weekday morning to avoid crowds and passing vehicles.
Wear shoes with good grip, as the area near the walls can be slippery due to water runoff.
Do not attempt to park in the tunnel itself, as it is an active road with traffic.
Do not touch or peel the moss, as it is fragile and essential to the site's ecosystem.
