I was reverting a changeset nearby and I noticed http://www.openstreetmap.org/#map=15/45.6904/-73.6458
(there are a number of flooded islands outside of the obvious one). This is likely to the multi-polygons for the Riviere Des Prairies being a bit of a mess. I've found: https://www.openstreetmap.org/relation/1747232 (broken geometry, no islands) https://www.openstreetmap.org/relation/1747225 (broken geometry) https://www.openstreetmap.org/relation/1769788 (overlaps the above, island(s) missing, broken geometry) https://www.openstreetmap.org/relation/1746332 (geometry ok, contains islands) There may be more. I suspect that the likely working combination could be 1746332 and 1747225. But over to the local community. Simon
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