Ronarc'h Peninsula is a peninsula in the south-east of the principal island of Kerguelen. It is connected by a narrow strip of land to another peninsula, namely the Presqu'île Jeanne d'Arc to the southwest, which is approximately twice its area.

The Ronarch Peninsula forms the southern limit of the Golfe du Morbihan (Kerguelen)

Golfe du Morbihan (Kerguelen)

The Golfe du Morbihan of the Kerguelen islands forms deep and broad notch in the central section of principal island of the Kerguelen Islands, Grande Terre....

. It corresponds to the Courbet Peninsula

Courbet Peninsula

The Courbet Peninsula is a vast peninsula occupying the northeastern portion of the principal island of Kerguelen. In the south of the peninsula is Port-aux-Français, the principal station of the archipelago.-Geography:...

and Prince de Galles Peninsula which form the northern limit of the gulf. The Ronarch Peninsula and the Prince de Galles Peninsula are separated by a narrows called the Royal Passage.