It is the oldest and most characteristic port of Porto Santo Stefano. Between the end of the sixteenth and the beginning of the seventeenth century, thanks to the Spanish rulers of the State of the Presidi, the locality began to assume a strategic role, being endowed with fortification. Just in the seventeenth century was built the port, which was protected behind the Ancient Tower, which rose in the Piazza dei Rioni where there is the current municipal headquarters, and was completely destroyed by the bombings of World War II.
In recent times, new commercial and industrial requirements favored the more modern and wide Porto del Valle; since then, the Old Port began to be a landing place for fishermen, until becoming a characteristic tourist mooring during the last century.
Located on the Tyrrhenian Sea, the port opens to the north-west towards the sea, closed in a small natural bay. At the western end, there is a breakwater pier called Il Moletto, with signal lantern, along the west bank there is the Pilarella quay, to the south is the Piazza dei Rioni, to the east the Lungomare dei Navigatori.
The depths vary from 1.5 to 5 meters deep, access is difficult with strong winds of the first quadrant. The berths are approx. 130, divided between the only quay and three rows of mooring berths.
During the month of June, it is home to the Argentario Sailing Week sailing event organized by the Yacht Club Santo Stefano.