What country is 57 N latitude and 10 E longitude?

Answer 1

A set of latitude/longitude coordinates defines a single point on the Earth's surface,

so it's not possible for a whole country to be right there.

That particular point is just outside the city of Ålborg in Denmark. Any other point

in Denmark has different coordinates.

Answer 2

The coordinates 57 N latitude and 10 E longitude correspond to the country of Norway.