A long narrow island at the mouth of Van Mijenfjorden, central Spitsbergen. The island separates Van Mijenfjorden from Bellsund. Carbonates, limestones, shales and anhydrites make up the local strata of Upper Permian to Lower Triassic age. The strata are near-vertical owing to the collision with Greenland, forming the Spitsbergen fold and thrust belt.