I want to make a large island made up of alot of chunks, my question is, when the island is complete, will each default size bit of terrain be a seperate chunk which will unload when it is out of sight? And can I connect another terrain piece to it in order to make the island large, or do I just scale one it of terrain to the size I want it and will that be divided into ‘chunks’ by the engine itself? Cheers.
The engine does not do this out of the box. Terrain tiles are not unloaded when they are hidden. You could write a system to do this using asset bundles, i myself created a terrain paging system a few years ago using asset bundles that loaded 30gb~ of terrain data, so it is possible.
The asset store also has several items that could help.
E.G Unity Asset Store - The Best Assets for Game Making