This was one of the most challenging biking days of the trip. Leaving Hoang Su Phi early morning, we turn off onto a remote track leading though mountains. On this part our support vehicle was not able to follow, limited to a motor bike (which even found the going tough). It was a steady, and often steep, climb up to the summit following not more than a “goat track”. The ride however was highlighted by a long descent punctuated with waterfalls and switchbacks, which flowed seamlessly into some sinuous riverside single track. It made for some fantastic mountain bike riding. Eventually we emerge onto rough tarmac before being shuttled to the buses on the back of a truck over road that had been severely washed away in many places.