ケベック・ラブラドール（カナダ東部）のフィヨルド湖のスワース水深測量画像

Accurate mapping of inland waters is essential for managing freshwater resources. This mapping is usually undertaken using single beam echosounder, which provides interpolated low-resolution bathymetric maps. Over the past decade, high-resolution swath bathymetry was acquired for nine fjord-type lakes in Québec and Labrador (eastern Canada) using a multibeam echosounder or an interferometric sonar. Together, these lakes represent more than 46,000 million m³ of freshwater. The dataset includes seven lakes from the Canadian Shield (Mékinac, Jacques-Cartier, Pasteur, Pentecôte, Walker, Manicouagan in Québec, and Grand Lake in coastal Labrador) and two from the Appalachian Mountains in southeastern Québec (Pohénégamook and Témiscouata). Swath bathymetric data of these large waterbodies provides a baseline for scientific research and ongoing conservation efforts.