How to make an emission glow for certain part of a texture?

So, I have a 3d globe that when you on hover on the continents, it changes materials so the hovered continent is "selected".

I'm using a single sphere with a texture of the planet, and that material texture changes around.

Now I want it to have an emission on that selected glow... Of course, if I use the Emission option on the Standard shared material, the whole planet glows, not the continent with the different color.

I even tried having transparent textures for the single continent but its the same (even the transparent part glows)

How can I achieve this effect?