The Île de l'Ouest is a French island in the Kerguelen archipelago located west of Grande Terre in the extension of the Lakes peninsula, by the foothills of the Cook glacier. It has two bays:Noroît Bay to the north and Bretonne Bay to the south.
It is divided by the Grande Terre by the détroit de la Marianne (Marianne's strait).
The highest point is a mountain named Pic Philippe d'Orléans, at 617 metres.
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