The Fidelia Isthmus (53°01′18″S 73°22′05″E / 53.02173°S 73.36812°E / -53.02173; 73.36812) is an isthmus that connects the Laurens Peninsula with the rest of Heard Island, a subantarctic territory of Australia in the southern Indian Ocean.
[1] Mount Aubert de la Rue looms over it.
The isthmus is named after Fidelia Heard, the wife of John J.
[1] Fidelia Heard made the first known drawings of the island.
[1] A 2016 expedition to Heard Island found that the isthmus had been breached by two channels, further separating the Laurens Peninsula (also known as "Red Island").