https://en.wikipedia.org/wiki/Nottaway_River lists Lemoine Island and Lavoie Island (not yet mapped in OSM) as the two main islands at the mouth of the river. And https://geonames.nrcan.gc.ca/search-place-names/coordinates?latdeg=51&latmin=17&latsec=28.32&londeg=78&lonmin=55&lonsec=27.48 shows the two islands as part of Quebec.