Need help understanding this satellite image of Larson C ice shelf
I found a natural-color image of the same area: 68.28 South, 60.47 East, North is up, resolution is 130m/px, which makes the whole image about 100 km x 100 km. Looking at the image i'd say that:


sea ice is water with pieces of ice in it,
the boundary between the two regions is clear water, probably caused by winds and currents moving the floating ice away from the edge of the ice shelf.


I got the image at Sentinel Playground using 100% cloud filter, 0.3 gain and date selection of 2016-11-21.

EDIT: Added more info about the position, scale and orientation of the image.