European Space Agency.The giant piece of ice is shaped like an ironing board and it’s about 105 miles in length and 15 miles wide - to put that into perspective, Manhattan Island is only 22 miles in length and 3 miles wide.Dubbed A-76, the iceberg calved off the Western side of the Ronne Ice Shelf, lying in the Weddell Sea, according to the ESA.A-76 after breaking off of Ronne Ice Shelf in Antarctica. RELATED: Climate change likely to worsen despite worldwide pledges to cut carbon emissions, report findsIceberg calving is a natural and important step to the life of Earth’s ice sheets and takes immense amounts of time to happen, according to the Centre for Polar Observation and Modeling. "Rates of calving often change annually, with calving.