The depression/lake in the middle of Greenland is there because of the weight of the ice on top, that would became at least considerably smaller if wouldn't disappear if all ice melted. This is the so called post-glacial rebound

Here is a map of Antarctica which considers this rebound as well, not just sea level rise:

Caption of the map:

This is topographic map of Antarctica after removing the ice sheet and accounting for both isostatic rebound and sea level rise.

Northern Europe is still slowly rising since the end of the last Ice Age, maximum uplift is 11 mm/year.

Was just going to axe the same question

Pro-tip - go on Google maps, find a piece of land that suits your campaign needs, screenshot it, rotate 90°. Nobody will ever notice it's a real place.

Well aliens had to get the dirt somewhere