China's Longest & Best Motorcycle-Friendly Tracks/Trails

[MotoKai]

They say the best roads in California are DIRT!
There's also the Continental Divide Ride stretching from Canada to Mexico.
And from Eastern to Western US runs the TAT.
Australia has miles upon miles of motorcycle tracks.
Canada has its logging trails.

But what are China's longest motorcycle-friendly tracks and trails?
Where can the best stretches of back roads, fire trails, dirt roads be found?

Below are examples of US/Aussie tracks, but what are the Chinese equivalents?

California Back Roads
http://www.totalescape.com/active/wheelz/bkrds.html

The Great Continental Divide
http://www.twotaildog.com/Motorcycli...vide_Intro.htm

The TAT (The Trans-Am Trail)
http://www.transamtrail.com/about/

Australia's Victorian High Country

Click here for landing page that has the entire series: http://www.soku.com/search_video/q_Y...ry Test Part 2

Variations of this topic have been brought up in other threads before, but without resolution.
There was a discussion on mapping tracks and sharing tracks with Roads2Go (great site, but maps fail to load here in China).
The alternative (albeit inferior site) is Motowhere, which I recommend for us to use for this thread purpose.

Rules:
- Please don't use this space to share your favorite tarmac stretches.
- This thread is for dirt, mud and water-crossings only.
- The longer the better (200km+ stretches).
- Trail to be "ride ready". This means no machete needed!