This mod brings back the FarLands and optionally removes the World Border entirely, allowing you to essentially go as far as you want. This mod fixes many bugs and crashes that occur at very high distances, but weird things still occur when going over certain values in distance.

This mod has 2 config options:

Enable Farlands: Enables the generation of FarLands terrain. Enabled by default.
Enable Infinite World: Removes the world border entirely. Disabled by default. !! USE AT YOUR OWN RISK !!

I have personally ventured up to around 2 trillion blocks from spawn (2.000.000.000.000 blocks).

The milestones you can reach are as follows:

The FarLands start at 12.550.821.
At 33.554.432 you can no longer interact with anything and mobs will appear as if they have no AI. If the mod is used server-side only lighting also stops working here.
At 9.223.372.036.854.775.807 (64-bit integer limit) is the maximum value you could possibly reach where everything would break down. I have not yet reached this value without crashing.

Looking for a fun place to play Minecraft and try out some of my mods? Come hang out on the El Basurero SMP!