Minecraft wiki entry for End_gateway, associated text: The second set of End gateways are generated randomly throughout the outer islands further away from the central island, after the gateways there having been first activated. As each of them has a direct connection to one of the gateways on the central island, they can teleport the player back to the locations of their corresponding End gateways or the original obsidian platform. Thus allowing the player to easily teleport back and forth between the different islands.