Boryeong Undersea Tunnel
보령해저터널
Korea's longest undersea road tunnel (6.9 km), opened in 2021. It runs from Daecheon Port directly to Wonsando Island, then connects to Anmyeondo via the Wonsando Bridge.
The Boryeong Undersea Tunnel is 6,927 meters long, making it Korea's longest and the world's fifth-longest undersea road tunnel. At its deepest point it lies about 80 meters below sea level. It links Wonsando Island, which was previously reachable only by boat, with Daecheon Port by land, and then continues over the Wonsando Bridge to Anmyeondo in Taean, forming a self-drive loop along the west coast. The tunnel is free to use, and the drive takes about 10 minutes. Some sections have color-changing lighting. Walking and cycling are not permitted. It works well as a half-day self-drive combined with Wonsando Beach and the Anmyeondo area.
Opening hours
All day
Nearby sights
- Daecheon Port & Fish Market
- Boryeong Mud Festival & Mud Square
- Daecheon Beach
- Wonsando Beach
- Sanghwawon Garden (Jukdo)
- Chungcheong Suyeong Fortress & Ocheon Port
- Muchangpo Beach
- Sapsido Island