Minecraft wiki entry for Obsidian_platform, associated text: The obsidian platform generates at coordinates (100, 48, 0), mostly far away from the island, making it tough to get there. Players who enter the end spawn at coordinates (100, 49, 0) and the other entities that enter the end spawn coordinates (100.5, 50, 0.5), in the middle of and 1 block higher than the platform. Sometimes the platform generates inside a case of end stone; enough end stone is removed in this case so that the player can walk around, with 4 blocks high of breathing space. Occasionally the platform generates in midair.