Item is a map showing details of Louisbourg Harbour and Gabarus Bay with a full inset map of Cape Breton Island, labelled Isle Royal. Documents the landing place and camp of the New England forces as well as the fortified town of Louisbourg, various battery locations, French settlements and the lighthouse.

This item is a hand-coloured map of Isle Royale (Cape Breton Island) by Jacques Nicolas Bellin from the Petit Atlas Maritime published in 1764. During the French colonial period, permanent settlement on Isle Royale grew to 4000. This map shows changes in place names reflecting the French and Mi'kmaw presence.

This map was originally part of Bellin's "Le Petit Atlas Maritime" showing French fortifications destroyed during the 1758 siege.