They call it the fringe lands, it's a part of the map where the terrain breaks down gradually in many stages. It happens when you divide 2^1024 by 171.131 by either the 5th or 6th octave or something. There is a mod in Minecraft 1.20.1 called the BigInt mod that allows Minecraft to be completely playable even beyond 2^1024 from what I heard.
This is true but these instructions are highly specialised to AES encryption and decryption and intended for use in hardware encryption schemes like Bitlocker, Filevault (when Apple used x86) and so on. It's not generic 128 bit support. The instruction set supports AES 128, 192 and 256.
The Fringe Lands is a section of the far lands at the outmost edges of terrain generation just after over 9 quindecillion blocks of the Farther Lands.
