The Rome marathon will be taking place on Sunday, April second. The marathon began 1982 and has been held for 32 out of the 35 years since. However, this specific race accounts for only the past 22 of those years. The 42 km course sticks mostly to the Tiber, going down to Ostiense and up past the Vatican. The race starts and ends on Via dei Fori Imperiali between Piazza Venezia and the Colosseum, and passes most notable Roman sites including: the Vatican, Via del Corso, Piazza di Spagna, Piazza del Popolo, as well as many others.
For those who are not up for the full marathon, there will also be the 4.5 km Roma Fun Run taking place, and although signups for the marathon have closed, signups for the Fun Run will be open until the 1st. That course also leaves from Fori Imperiali but then passes Bocca Della Verita, loops around Circo Massimo, down to Piramide, and finally ends in back Circo Massimo.