The sprawl from the center of Porto runs all the way to Gião, where a revision to the camino takes you mercifully off of the road and to Vairão where a more tranquil walk resumes. That is a stretch of 25km, more than enough walking given the terrain. It is not uncommon for pilgrims to bypass much of this sprawl by taking the metro to the suburb of Araújo.
The easiest starting point for leaving the city is the Cathedral. With your back to its main door (facing west) pass the tower, keeping it on your right and follow the ramp downhill. Jog left then right around the building that is at the bottom of the ramp and then look to your left for a set of stairs that... (continued in Camino App and Book)