Minecraft wiki entry for After_Beta_1.8, associated text: The edge Far Lands and corner Far Lands, as well as their Farther variations, generate relatively identically to their pre-Beta 1.8 counterparts, but utilizing the entire height limit, causing them to generate all the way up to y=256, or in the case of infinitely high worlds as seen in the case of mods, until they reach the sky Far Lands at y=+25,101,648 (and equivalently the void Far Lands at y=-25,101,648). Since the 20w06a snapshot however, edge far lands are thinner and more geometrical, with a cross-section made of perpendicular lines and rectangles.