I am wanting to create a terrain that could be used on a MMORPG. I want to have 21 lands and I have tried to do it all as one big terrain but then when I go to paint it the brush will got go small enough to be able to pain small details in. I have tried using multiple terrains but when aligned up you can see a seam. Any help would be great thanks.
Try using Terrain.SetNeighbors to make the seam go away if you do so with multiple terrains.
You can find the reference here.