The stretch of coast of the province of Rome from Civitavecchia in the north to Neptune in the south is considered as a Roman coast. The Roman coast, although the coast is mainly sandy, has seabed of different nature (rock, sand, algae, pebbles, mud). It has historically been a point of commercial traffic by sea and archaeological remains are still visible today as evidence of this. There are numerous freshwater streams that flow there, the most important of which is the Tiber river while among the secondary we remember: the Astura, the Sanguinaro, the Arrone, the Micino (incorporated into the Trajan's Channel that gives its name to the city of Fiumicino). The municipalities of the Roman coast are: Neptune, Anzio, Ardea, Pomezia, Rome, Fiumicino, Cerveteri, Ladispoli, Santa Marinella and Civitavecchia. There are numerous hamlets of these municipalities: Lavinio, Tor di Caldano, Lido dei Pini, Tor San Lorenzo, Torvaianica, Lido di Ostia, Isola Sacra, Focene, Maccarese, Passo Oscuro, Palo Laziale, Palidoro, Marina di San Nicola, Santa Severa and Sant'Agostino.