Talk about infinite canvas!

I haven’t explored every bit of the most recent xkcd, but I think I may have found its outer edges:

• Starting point
• Rightmost tile
• Leftmost tile
• Topmost tile
• Bottommost tile

Given those URLs, it ought to be possible to write scripts that’ll download all the tiles (some spots seem to be procedurally filled with white or black space instead of having tiles) and stitch ’em together into the full image. Maybe tomorrow.