It's nothing dramatic but if you want to make it as realistic as possible, you should make the Appalachian mountains go toward Maine and New Brunswick instead to go straight into Quebec. There are some mountains (still, small compared to the Alps) but they belong to the Canadian Shield, a different geological element.

Appalachian Mountains - Wikipedia, the free encyclopedia

More importantly, I think that the continent label should be easier to read. It's hard to see because there are other elements around them. You could try putting an emphasis ( Emphasis (typography) - Wikipedia, the free encyclopedia )