Satellites: NOAA-15 and NOAA-17, part of NOAA's 850km-high (530 mile-high) Polar Orbiting satellites

Ice breakup on Hudson Bay
This image shows Hudson Bay (Canada) and its ice blanket. You can see the extensive network of cracks forming as the ice breaks up for the spring.
The red lines are lined up with the land--it's just that the distinction between the shoreline and the water is so obscured by the ice.
On the southwestern shore, the ice still extends out into the bay for several kilometers, as well as extending inland quite a ways.
Click on the image below for a higher-resolution (>100k) version.