The Fontana del Nettuno (Fountain of Neptune) is a monumental fountain

Fountain

A fountain is a piece of architecture which pours water into a basin or jets it into the air either to supply drinking water or for decorative or dramatic effect....

 located in the Piazza del Popolo

Piazza del Popolo

Piazza del Popolo is a large urban square in Rome. The name in modern Italian literally means "People's Square", but historically it derives from the poplars after which the church of Santa Maria del Popolo, in the northeast corner of the piazza, takes its name.The piazza lies inside the northern...

 in Rome

Rome

Rome is the capital of Italy and the country's largest and most populated city and comune, with over 2.7 million residents in . The city is located in the central-western portion of the Italian Peninsula, on the Tiber River within the Lazio region of Italy.Rome's history spans two and a half...

. It was constructed in the 1822-23 at the terminus of a newly-built aqueduct, the Acqua Vergine Nuovo. The fountains in the Piazza del Popolo were the work of Giovanni Ceccarini. The Fontana del Nettuno is located on the west side of the square, and shows Neptune

Neptune

Neptune is the eighth and farthest planet from the Sun in the Solar System. Named for the Roman god of the sea, it is the fourth-largest planet by diameter and the third largest by mass. Neptune is 17 times the mass of Earth and is slightly more massive than its near-twin Uranus, which is 15 times...

 with his Trident

Trident

A trident , also called a trishul or leister or gig, is a three-pronged spear. It is used for spear fishing and was also a military weapon. Tridents are featured widely in mythical, historical and modern culture. The major Hindu god, Shiva the Destroyer and the sea god Poseidon or Neptune are...

, accompanied by two Tritons

Triton (mythology)

Triton is a mythological Greek god, the messenger of the big sea. He is the son of Poseidon, god of the sea, and Amphitrite, goddess of the sea, whose herald he is...

.