Lake Nemi (Italian: Lago di Nemi) is a lake located in Italy.
Roughly 30 kilometres south of Rome, this small volcanic lake is named for the largest town in its vicinity, Nemi. It is most renowned for its massive sunken Roman ships, the larger of which are thought to have been elaborate floating palaces of the 1st century.
Some of the technology found on these ships was believed to have been invented only recently, including complex heating systems and plumbing for baths.
During the early 16th century, Cesare Borgia had established a weapons factory near the lake which manufactured chariot-mounted machine guns. In 1502, the Assassin Ezio Auditore da Firenze broke into the factory, burned the plans for the machine and destroyed the only two prototype machines in existence.