What is the name of the largest Baroque fountain in Rome?

The largest Baroque fountain in Rome is the Trevi Fountain.

Located in Rome's Trevi district, the fountain stands against the Palazzo Poli and measures about 26.3 metres high and 49.15 metres wide. Its central figure is Oceanus, shown riding a shell-shaped chariot drawn by sea horses and guided by Tritons.

The present fountain was designed by Nicola Salvi after Pope Clement XII held a competition in 1730. Construction began in 1732, and Giuseppe Pannini completed the work in 1762 after Salvi's death. The fountain's water comes from the Acqua Vergine, an aqueduct whose origins reach back to ancient Rome.

A common mix-up is confusing the Trevi Fountain with Bernini's Triton Fountain in Piazza Barberini or the Fountain of the Four Rivers in Piazza Navona. The name “Trevi” is traditionally linked to trivium, Latin for an intersection of three roads.