The Far Lands in Minecraft begin at approximately 12,550,820 blocks away from the world's center or spawn point. This distance is roughly 12.5 million blocks from spawn. The Far Lands represent a terrain generation glitch area where the game's terrain generation algorithm breaks down, causing strange terrain formations. The area extends beyond this point into much farther distances, but the classic Far Lands start around 12.5 million blocks from spawn.
