I'm think about creating large terrain area but I don't know how to convey borders of the world becuase player could step off the terrain and fall of. I thought that the best would be place mountains around the borders. I've made an mountain with 4052 polygons. Now if I place them around the borders, this would be like 12 mountains. Now, there would be also some assets around Is this OK for having optimize terrain? How to prevent using additional terrains? When I snap 2 terrains next each other, there are visible seams. Is there better off to hide the borders of the terrain ? How to make better open world level ?