“Skeletonized” is an understatement, judging from the Montreal sectional. Topography, roads, and cities, towns and (sometime very small) villages are indicated, along with only the bigger airports, which themselves are indicated by circles, name and identifier (no runway length, AWOS or CTAF/tower frequencies). Other airports of landmark or emergency values have vanished. Interestingly, there’s a box that reads: “Limited chart information provided outside of US airspace…” That information would come from Nav Canada, which has been experiencing major personnel shortages (leading, for instance, to Montreal Terminal routinely denying services to VFR traffic this past summer). For those who asked, the Canadian sectional charts, though slightly different in appearance, do feature the detail you see in their US counterparts, including those charts that straddle the border.