The bridge over the Guadalquivir connects the old quarter of Seville and Triana. The name of the bridge depends a bit on whom you as for it’s name. Yes, that’s typical for Seville, many places have more than one name. With the changing perspective changes the name.
Anyway the bridge of Isabel or Triana is one of the monuments you should see in Seville. It is a great place to meet and start a nice walk along the promenade. You can see Triana with Calle Betis, the Castillo San Gorge and the Faro or on the other side the Torre de Oro, Maestranza and of course the Giralda.