Öakse comprises 7.6 hectares in area and is located in the Soonlepa Gulf, approximately one km from the Salinõmme Peninsula on the larger island of Hiiumaa to the west and approximately 300 km from the smaller islet of Auklaiust which lies to the west  and is administered by Hiiu County. The island is part of the Hiiumaa laidude kaitseala (Hiiumma Islets Landscape Reserve). The island of Öakse is elongated in a northwest-southeast direction, and crescent-shaped. The shoreline is sinuous and the south-east tip of the island is rocky and concludes with a set of large boulders. It is approximately 8.2 meters above sea level.
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