Thamusida is an ancient Roman river port in Morocco, near Kénitra and Mehdia.
The site was excavated from 1913 by the French, then 1959 to 1962[1] and since 1998. Many items found in Thamusida are today on display at the Rabat Archaeological Museum. It occupies an area of fifteen acres. Excavations have unearthed the walls of the docks and baths. Under the Antonines, a temple was built to worship Venus.
The site was abandoned around 280.