The bridge built over Busseri river is a major landmark for these people. They are now about half-way through their journey.
The first bridge they built on their trek collapsed under a truck full of passengers.
The vehicle overturned in the river and 23 people were crushed to death. That accident prompted aid agencies to provide them with logistical and medical help.
A small group of workers from the International Organisation for Migration - including a doctor - is travelling with them.