There are a couple of possible ancient meteor craters in eastern Canada. The southeast corner of Hudson Bay has a remarkably circular shape that would indicate a possible impact site, with the Belcher Islands as the "cone" of the crater.
Also, the Manicouagan Reservoir is a peculiar circular body of water surrounding a large land mass that was formed behind the Daniel Johnson Dam in northeastern Quebec.
Interesting; I hadn't heard of those.
Have you ever been to Meteor Crater in Arizona? An unbelievably impressive sight/site.