How to create transitions between scenes by clicking on highlights of a planet

Hello everyone I am currently working on creating my own video game to learn how to use the engine and I have a doubt, how can I generate a highlight on a planet that when I click on the scene change of the planet view scene to a surface scene, I do not want to create a complete planet with space earth transition, only two scenes, one that shows the planet with those highlighted provinces and when I click on it, I change to a new scene of a terrain that I have modeled, if could explain it to me or take me to a tutorial I would appreciate it, greetings.