If you are into worldbuilding, worldanvil has a great website that allowes you to structure your thoughts. The site can be overwhelming at first, but you dont need to study it for too long before you can start jotting your ideas down, it also helps you connect your different ideas.

The most attractive thing for you here though is probably the map function. You can upload images of your map, tag areas and make sub areas you can click on and display information.

You can read more about it here: https://www.worldanvil.com/w/WorldAnvilCodex/a/maps

Hope it was of help