Look at this satellite view on Goolge Mpas in Victoria Island in northern Canada.
See how the “grain” of the land, made of low ridges and small lakes, seems to form a semicircle around the area I linked to? It’s not a full circle, and to the south the “grain” seems to break down and fan out towards the south.
Does anyone know what this is caused by? An ancient impact, or just freeze-thaw patterns?