Archaeology
Archaeology of the Aveiro Lagoon
Underwater archaeological sites in the Aveiro Lagoon, featuring 15th and 16th-century shipwrecks documenting Iberian-Atlantic and Northern European…
The Aveiro Lagoon, a vast coastal lagoon in central Portugal, contains one of the country’s most remarkable collections of underwater archaeological sites. The siltation process that formed this shallow-water lagoon system has protected shipwrecks and their cargoes for centuries under rare preservation conditions. As a result, the lagoon holds an unparalleled quantity and diversity of nautical remains in the Portuguese context, with international significance.
The Ria de Aveiro A Ship
The most emblematic site is the vessel designated Ria de Aveiro A, whose wreck was identified in one of the lagoon’s channels at a location known as “monte dos cacos” (shard mound). Rescue archaeology operations began in the mid-1990s under the responsibility of what was then Portugal’s National Centre for Nautical and Underwater Archaeology (CNANS). Radiocarbon dating placed the vessel in the mid-15th century.
The preserved hull section represents, on an international scale, the oldest known evidence of the so-called Iberian-Atlantic naval architectural tradition and the closest contemporary example of the caravels associated with Portuguese maritime expansion. Surrounding the hull was an extensive cargo of regional common pottery, with thousands of fragments and dozens of intact pieces — one of the most complete assemblages of late medieval Portuguese utilitarian ceramics ever recovered. This collection allows simultaneous study of nautical and underwater archaeology and the circulation of ceramic products in the early modern Atlantic.
Other Shipwrecks and the AMRA Project
Beyond Ria de Aveiro A, the lagoon has revealed other vessels. The Ria de Aveiro F and Ria de Aveiro G wrecks, dating to the early modern period, show characteristics typical of Northern European shipbuilding, documenting the region’s connections with Atlantic and Northern European trade routes. These are complemented by port contexts and ceramic cargoes associated with one of the access channels to the city of Aveiro.
The systematic study of these sites was conducted under the Aveiro Lagoon Maritime Archaeology Project (AMRA), coordinated by CHAM — NOVA FCSH Humanities Centre, with support from Portugal’s Directorate-General for Cultural Heritage and the Foundation for Science and Technology. The project consolidated dispersed research on the various shipwrecks, integrating it into the history of the medieval and modern lagoon and its connections to European and Atlantic networks.
Significance and Conservation
The Aveiro Lagoon complex is now an essential reference in Portuguese nautical archaeology, alongside other important sites like the Arade shipwrecks. Recovered materials — from hull structural elements to ceramic cargoes — have undergone conservation, study, and museum display, contributing to knowledge of shipbuilding techniques and commercial dynamics that linked the Portuguese coast to Atlantic shores between the 15th and 16th centuries.
Frequently asked questions
- What is the Ria de Aveiro A ship?
- It is the wreck of a vessel radiocarbon-dated to the mid-15th century, considered the oldest known remnant of the Iberian-Atlantic shipbuilding tradition and the closest contemporary example of the caravels used during the Age of Discovery.
- What types of shipwrecks have been found in the Aveiro Lagoon?
- Vessels of Iberian-Atlantic tradition like Ria de Aveiro A have been identified, along with Northern European-style ships such as Ria de Aveiro F and Ria de Aveiro G, plus port contexts and ceramic cargoes.
- Why is the Aveiro Lagoon important for nautical archaeology?
- Centuries of siltation in the lagoon have preserved an exceptional number and diversity of remains, making the Aveiro Lagoon one of Portugal's most significant reservoirs of underwater cultural heritage.