In-game mod designer

[neondt]

Province designer: Basically, you get to look around the EU4 world like you do when you're select a nation to play as. Except there is a menu on the right with the following things:
- Create new province
- Edit existing province
- Remove province

Clicking "create new province" would bring up a new interface where you can select whether you're creating an island or creating one entirely on land. If you're creating an island, you can "paint" the province on the water. Once you have created the base province, you can edit height, terrain, name, and all that other crazy fun province stuff. If you select a land province, you can drag your mouse over the land to create the borders of it. Once that is done, you can set the same things as above.

If you edit an existing one, you can move the borders, rename it, and change all the same settings as above.

If you're removing it, you have to edit the province borders around it to fit or select it to be a colonial province.

This is almost certainly impossible.

However, some of what you're looking for can be done in the Scenario Editor, which is a very useful modding tool. https://forum.paradoxplaza.com/foru...cing-a-scenario-editor-and-map-viewer.707474/