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

Two meteor impact craters in Canada
One of the craters is just to the right of the very center of this image. The other crater is near the upper left, just about to be covered by a cloud bank.
These impact craters have the characteristic circular shapes surrounding a central higher mound.
While we've all seen such shapes when we've thrown stones down in the mud, the physics of the formation of such craters is actually very complicated.
As such craters weather over the ages--as these have--they typically reveal themselves with their tell-tale circular lakes.
Click on the image below for a higher-resolution (~100k) version.