Typical way is to use the same-sized tilemap as a “chunk” and switch the tilemaps out when you try to exit the tilemap. If you want it to be infinite, then you can look at something like this. 
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Typical way is to use the same-sized tilemap as a “chunk” and switch the tilemaps out when you try to exit the tilemap. If you want it to be infinite, then you can look at something like this.