I am currently preparing a homebrew campaign and I want to start creating some maps for my world. I am not that good at drawing so I am looking for an app/website where I can create maps. I wanna create both large and small scale maps. I need maps depicting the whole world, a region/city, or just the setting a battle is taking place.

I've been wanting to create a map of the land I've created for my sessions, but I mostly use my phone for everything from character generation to notes and more. Is there an app that would be good for creating my own map rather than generating one? I'd like it to have a little more functionality than just an app for drawing, but better than some of these poor dungeon generators that are rather limited in what you can actually create. (For anyone that's going to say what good is a map on a phone, I screen cast to tvs a lot when needed and I'd like to show my players where they are at in the world without carrying around additional material, especially now that I can run my sessions entirely from my phone.