Tui is a border city on the river Miño, facing Valença. Up until 1833, it was the capital of one of the seven provinces of the Kingdom of Galicia. As it is just over the 100 km mark from Santiago de Compostela and still on the Spanish side of the river Miño, Tui is the starting place for nearly half of the pilgrims walking the Camino Portugués.
If you are walking the Camino Portugués from Tui, you can obtain your credencial from the cathedral (see map below), and start walking from there. Don't forget to collect two stamps every day.
What to see in Tui
Catedral de Santa María
The construction of the fortified cathedral, occupying the highest point in Tui, began in 1120 and lasted until 1225. It bears both Romanesque and Gothic characteristics. Inside, across the central nave, there are buttresses that were erected later, exactly due to this contrast of building styles, to prevent the building from collapsing. In the Chapel of Santiago, there is a representation of Santiago Matamoros, dating from 1696.