Recent reports of melting Arctic ice have grabbed headlines. But in 2008, a Manhattan-sized chunk of ice, the Markham Ice Shelf, detached from Ellesmere Island and started drifting around the Arctic Ocean, according to Planetsave.com. The size of that chunk was 19 square miles, and it was joined by two others that split off from the Serson Ice Shelf, the environmental website Planetsave said. The 47-square-mile pieces totaled 60 percent of the shelf. Now we are grappling with even more ice loss, with predictions that summer ice will be a thing of the past this century, according to the State of the Arctic Coast report, released in April.
See this CBC News report of the 2008 ice-shelf split.