The Arade Shipwrecks

The Arade shipwrecks constitute one of Portugal’s richest nautical and underwater archaeology complexes. They are distributed across the riverbed and estuary of the Arade River, in the area separating Portimão from Ferragudo in the municipality of Lagoa, extending to the river mouth near Ponta do Altar. For over two millennia, the Arade was the stage for intense maritime activity, clearly evidenced in the surviving remains that document navigation, trade, and the movement of goods between the Mediterranean and the Atlantic.

A repository of long chronology

The archaeological potential of the estuary became evident in 1970 when dredging works at the river mouth uncovered significant remains, particularly from the Roman period, along with several shipwrecks. Systematic research initiated in 1993 confirmed the site’s scientific and heritage value. Since the 1970s, approximately three thousand objects have been recovered from the Arade riverbed, dating from the Iron Age to the 20th century.

Among the identified archaeological sites, the so-called Arade B stands out, recognized in 2001 during the ProArade project. This complex context combines depositional evidence from various periods—remains of Roman and modern shipwrecks and anchorages alongside more recent elements. The estuarine nature of the site, subject to currents and siltation, explains the overlapping of materials from different periods in the same area. This diversity aligns the Arade with other Portuguese underwater contexts like the Angra Bay Archaeological Park and integrates it within the broader field of nautical and underwater archaeology.

The Arade cannons and the historic port

The most emblematic find is the set of ten bronze artillery pieces recovered off Ponta do Altar near Ferragudo between 1992 and 2006. These artifacts are associated with the wreck of a ship likely serving the Spanish crown during the Iberian Union (1580-1640). Considered one of the most significant artillery collections from the period, they were classified as National Treasure in 2021. Three cannons are displayed at the Portimão Museum, while the others are held in the collection of the National Centre for Nautical and Underwater Archaeology in Lisbon.

Over the centuries, the estuary served as the natural access to the port of Silves and the western Algarve coast, linking these remains to the region’s riverine and maritime navigation history and to the Islamic archaeology of Silves at the river’s headwaters. Upstream and southward, other Atlantic estuaries—like the Sado near Alcácer do Sal—share this ancient port vocation.

Research and museum display

In recent years, Arade research has resumed through international cooperation campaigns, including partnerships with Norwegian institutions and investigations of estuarine wrecks like the 19th-century site designated Arade 23. The ongoing MUSA project plans to establish museum facilities on both riverbanks—in Portimão and Lagoa—dedicated to researching, conserving, and publicly displaying thousands of artifacts recovered from the river, ensuring this underwater heritage can be studied and appreciated long-term.