Map Creation

When i tried to make a ,map , i cant create shape for map .The shape of my map is square but i want custom shaped map like the erangel map of pubg .It has custom shaped .Can Anyone telll mee how to create custom shaped map.

The Erangal map in PUBG is also square. You are being fooled that it has a custom shape by the water. If you take away the water, you will see the pubg map is square, with the terrain on the edges being lower.

So design your terrain with a lower terrain on the edges and higher ground in the middle, or wherever you need it. Then put some water in at some height and you can create any shape you want.