Cloud Streets Over Lake Superior, Canada and USA48.7N 87.6W
The dark blue line curving across this image is the northern shoreline of Lake Superior, bounded to the north and northeast by the Canadian province of Ontario, to the northwest by the U.S. state of Minnesota, and to the south by the U.S. states of Wisconsin and Michigan.
The rest of the lake appears crossed by parallel white lines that gradually curve from the north to the southeast. These lines are cloud streets: long rolls of counter-rotating air that are oriented approximately parallel to the ground in the planetary boundary layer.
Also visible in the image is Lake Nipigon, in the upper left quadrant. Its surface is frozen and thus appears solid white. The lake drains into the Nipigon River and thence into Nipigon Bay of Lake Superior.