National Geographic-Lindblad Expeditions on Instagram: "The largest iceberg in the world is stuck yet again. 🧊 For more than 30 years, A23a was grounded on the Weddell Sea floor near where it originally broke off. The mega iceberg—equivalent to the size of Rhode Island—recently started heading toward open ocean, en route to warmer waters where it would rapidly melt and fragment. But a few months into A23a’s journey, the iceberg became stuck in a spinning ocean vortex. Through satellite imagery,