The following is an aerial view-radar map showing the areas where the two asteriods (Miriah & Merinda) landed.

Red outline is the Sudbury Basin. This is where Miriah landed about 2 billion years ago. The area was much larger millions of years ago.
Lake Wanapitei, this is where Miriah's sister Merinda landed about 400 million years ago.
Small red outline is the City of Sudbury.