3
there are many, but this one at 398 kb should probably work.
https://github.com/codeforamerica/click_that_hood/blob/master/public/data/canada.geojson
It's not "official", though. For official, you'll have to make your own geojson from here.
2
Earlier this year the "Land Cover Map of Europe 2017" with 10m pixel size has been published, see http://www.esa.int/Applications/Observing_the_Earth/Copernicus/Sentinel-2/Land-cover_maps_of_Europe_from_the_Cloud .
It is a pan-European map, yet potentially interesting for you due to its high spatial resolution.
At country level, you find for ...
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