It is one of the few remaining 'Baoxiansuo' (line patrol stations) originally built by the Japanese to monitor indigenous tribes and maintain telegraph lines.
The station is strategically positioned on a ridge, providing natural surveillance over the deep valleys of the Dadu River drainage basin.
The site remains active for employees of the Taiwan Power Company who manage the high-voltage electricity infrastructure in this rugged mountain region.
It is a required checkpoint for many hikers obtaining entry permits for the Nenggao-Yue-Ling Trail system.
The location was historically significant as part of the 'Nenggao-Gao-Yue-Ling' trail, which served as a major east-west transportation artery across Taiwan's central range.
Yunhai Line Station is a historic mountain outpost located at the 14.3-kilometer mark of the Nenggao Cross-Ridge Historical Trail in Nantou County, Taiwan. Originally established during the Japanese colonial period as a police station and post office for the patrol route, it now serves as a key rest point for hikers. The structure sits at an elevation of approximately 2,360 meters above sea level. It offers a vantage point for viewing the nearby Qilai mountain range and the North Peak of Nenggao. The facility maintains a functional role in supporting the maintenance of high-voltage power transmission lines that traverse the central mountain range. Visitors frequently stop here to adjust gear before tackling the more challenging terrain further along the trail towards the Nenggao cabin.
The grassy clearing immediately in front of the station building, facing the Qilai Mountain range.
Bring a portable water filter or sufficient supply, as mountain water sources can be unreliable.
Check local weather reports specifically for the Nenggao region, as mist and sudden temperature drops are common regardless of the season.
Pack layers to manage the significant temperature difference between the trailhead and this high-altitude station.
Do not attempt to reach the station without a valid mountain entry permit; avoid starting the hike too late in the day to prevent navigating high-altitude mountain trails in darkness.
Access may be suspended during typhoon season or following significant seismic activity due to landslide risks on the trail.
Pack out all waste, including organic matter; respect the private workspace of Taipower employees on site; keep noise levels low to avoid disturbing wildlife.
