A really nice section of an unpaved road into the Tatacoa desert via Villaviejo. This section follows and old railway line using the old infrastructure. The tunnels are dark and the road inside is quite lumpy. They’re both very short and full of bats that you can hear squeaking above you.
After here the route is a bit more hilly and there are some rough and sandy sections but I managed with fully loaded touring bike on 35mm tyres.