Minecraft wiki entry for Far_Lands, associated text: When finally in the Nether and adequately protected, the player must travel a few million blocks in the X and/or Z axis. It won't be so far as in the Overworld, but it will still be a long trip. Another portal will be required to exit the Nether, so, before proceeding, it is recommended to mine all the obsidian blocks of the portal and take them with you in order to lately reconstruct the portal. Evidently, flint and steel must also be taken.