This volume presents the proceedings of the HOMER 2021 international conference, held in September/October 2021 on the Island of Oléron, France. The conference focused on recent advances in coastal and island archaeology across a wide geographical area, covering the Atlantic north of the equator. From the 55 oral presentations and 24 posters, 49 papers emerged, contributed by scholars from seven countries.

The publication showcases the diversity of maritime archaeology, spanning fieldwork to specialized analysis, and from exploratory to synthesis studies. This volume is crucial for the archaeological community as it addresses both methodological issues and the new challenges facing coastal archaeology, reflecting diverse political perspectives.

It also presents new research findings, a decade after the Homer 2011 conference was published in 2013 (BAR), and emphasizes the importance of coastal archaeological heritage. The volume engages with current global challenges and serves as a valuable tool for raising awareness among the public and decision-makers about the future of maritime heritage in the face of rising sea levels. It demonstrates that archaeology is a dynamic discipline, adapting daily to political decisions and natural events.

Most of the case studies presented are previously unpublished. A key feature of this volume is its diachronic approach, ranging from prehistoric sites to historical ones.