It may be bigger than a large city - but the world's biggest iceberg can still turn on a sixpence.
The near-trillion-tonne frozen block, A23a, began its spin at the beginning of the year, while holding broadly the same position just north of the Antarctic Peninsula.
A23a broke from the Antarctic coast in 1986, before grounding itself on a shallow part of the Weddell Sea floor for three decades. It cannot be seen in the satellite imagery - but A23a is loitering just behind the South Scotia Ridge, which is like a submerged continuation of the peninsula.
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