Корсо
Northward, Trevi borders with Colonna (R. III), whose boundary is marked by a brief stretch of Via del Corso and by Via delle Muratte, Via di Santa Maria in Via, Largo San Claudio, Via del Pozzetto, Via del Bufalo, Largo del Nazareno, Via del Nazareno, Via del Tritone and Piazza Barberini. It also borders with Ludovisi (R. XVI), through Via di San Basilio.