The Watershed Tunnel sits along Beijing’s G111 Highway (Jingjia Road) in Huairou District, acting as a critical gateway to northern Huairou. This tunnel, part of the highway’s first-phase renovation, cuts through Yunmeng Mountain, making it a must-drive route for anyone heading to or from Huairou’s northern areas. As Beijing’s second-longest road tunnel—3,333 meters in the outbound direction and 3,412 meters inbound—it’s a landmark worth noting on your journey.

Getting There & Alternatives

To reach the Watershed Tunnel, drive along G111 from Beijing’s downtown. The tunnel is unavoidable if you’re traveling north, but adventurous souls can take a scenic detour: the old mountain road that winds around the ridge. While slower, this route offers breathtaking views and a taste of old-school driving—perfect for those who want to avoid tunnels or stretch their legs.

Natural Wonders: A Climate Divide

One of the tunnel’s quirks? It’s literally a temperature watershed. I once parked at the north entrance during winter, shivering at –6°C, then emerged at the south exit to a balmy 2°C. Talk about instant spring! But the real magic happens with weather. I’ve driven into the tunnel during dense fog (visibility below 50 meters) and exited to sunshine—like stepping into a different world. Locals joke it’s where Beijing’s weather resets.

Engineering & Safety Features

The Watershed Tunnel isn’t just long—it’s smart. Bright LED lights line the entire length, and loudspeakers broadcast safety reminders in both Chinese and English. Speed limits drop to 60 km/h inside, so leave your lead foot at home. Despite its size, the tunnel feels orderly, thanks to clear lane markings and ventilation systems that keep the air fresh.

Off-the-Beaten-Path Experiences

If tunnels aren’t your thing, the old mountain road is a hidden gem. Winding like a snake up Yunmeng Mountain, it’s lined with lookout points where you can pause for photos. In autumn, the leaves here turn golden, and locals sell roasted chestnuts by the roadside. It’s slower but way more immersive—think of it as Huairou’s “scenic route.”

Practical Tips for Drivers

  • Fuel up before entering, as services inside the tunnel are limited.
  • Keep a light jacket handy—those temperature swings can surprise you.
  • Tune into local radio (frequency FM 103.9) for traffic updates, especially during snowy months.
  • If hiking, note that the tunnel’s south exit leads to trails up Yunmeng Mountain.

Why It’s Worth a Detour

The Watershed Tunnel isn’t a typical tourist spot, but it’s a slice of Beijing most guidebooks miss. Whether you’re marveling at its engineering, testing weather-god luck, or contrasting modern efficiency with vintage mountain roads, it’s an experience that sticks with you. Next time you’re in Huairou, don’t just drive through—pause, feel the chill (or warmth), and remember: some divides are meant to be crossed.