Massive Arctic Sea Ice Fracture
Fractures of arctic sea ice, even in winter, are not uncommon, but the set of them which occurred this winter was extreme. It was a result of how thin the ice has become as the Arctic warms, and the wind pattern during late winter associated with a persistent strong high pressure system.
This image is from late February but has just been posted by NASA and the fracturing process which started in late January continued through March. The area pictured extends from the coast of Alaska in the lower left across the Beaufort Sea to the islands of northern Canada.