Altitude

Altitude is commonly expressed as a number defining the distance in layers above the base of the game environment, which is layer zero (0). Sea level is recognized as layer 62 (i.e. altitude 63), and as of Minecraft 1.2.0, the top of the game environment is layer 255 (i.e. altitude 256). Clouds appear halfway between the two at layer 127.

More specifically, the bottom face of the bottommost bedrock block is at Y coordinate 0, and the top face of the highest block that can be placed is at Y coordinate 255. The player can press F3 to see what Y coordinate the player's eye is currently at, with the player's eye located about 1.6 blocks above the layer the player is standing on. For example, a player standing on a shore of an ocean will see their Y coordinate as approximately 64.6.

Before Minecraft 1.2.0, the height limit was 127. In Creative Mode, players could fly above this level, but were not able to build above it. Note that sea level was still layer 62 before the update, so the height of the actual terrain did not change. This change in height was introduced along with the switch from the Region file format to the new Anvil file format, which was implemented in Snapshot 12w07a.

Natural resources and altitude
Features in the landscape of the Overworld are found at different altitudes, as shown in this graph:



There is also an interactive chart. Beware the logarithmic scale: a slight difference in the y coordinate means a large change in relative frequency of this block type. Some observations:
 * Looking at water, the ocean level at layer 62 is obvious. Going down, the amount decreases more quickly at layers 56 and 48, the usual depth of river and ocean biomes respectively. There are corresponding peaks in the amount of clay beneath them. (Note that clay can occasionally be generated even in high-altitude lakes.) Between layers 33 and 12, most water is falling down sub-ocean ravines, spreading out on the lava-filled bottom at layer 10 and producing most of the naturally-occuring obsidian.
 * Ores and gravel (not shown) usually occur as a fixed percentage of the amount of stone (also not shown), tapering off at the ends of their allowed range. This is why coal and iron follow parallel tracks between layers 40 and 60.
 * The one exception is lapis lazuli ore, which has a linear progression up to a peak at layers 13-14.

See the following table for a textual description of resources by altitude and tools needed to gather them.

Other naturally occurring features appear at different altitudes such as grass, wood, flowers, mushrooms, clay, cobblestone, sugar cane and Obsidian, but all of these features are random and will only appear in conjunction with another block and the proper environment.

The Nether
A similar graph, showing the distribution of blocks unique to the Nether:



History

 * Originally, solid blocks could be placed from layer 0 to layer 127.
 * As of Beta 1.6, solid blocks could no longer be placed on layer 127. However, beds, signs, torches and other non-solid blocks could be placed on layer 127.
 * As of Beta 1.6, entities are no longer invisible when above the build limit, however, they are black (like if they were in darkness).
 * As of the 1.8 Pre-Release, the player's view distance decreases in lower altitudes.
 * As of the 1.8 Pre-Release, entities are no longer black when above the build limit.
 * Before 1.8, the sea level was at layer 63 instead of 62. Players who have maps created before this update will find one-block-high "waterfalls" at the edges of the terrain previously generated when moving into new, post-1.8 terrain.
 * In 12w07a, the maximum height was increased to 256. This change was officially released with Minecraft 1.2.0. Sea level and terrain height did not change with this update; 127 layers were simply added above the cloud level, which had previously been the maximum.

Bugs

 * Above about Y:240, when you can see the horizon on "normal" render distance, the sun and moon are visible during day and night at the same time - only works at around sunset and sunrise.

Trivia


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 * The Beta 1.6 update made it impossible for players to place blocks on the uppermost layer of the map (Y-Coord. 127).
 * At extreme depths, black fog closes in.
 * Although the highest possible altitude the player can climb at normally is 257 (door "glitch" + jumping), a TNT cannon can blast the player many layers past the sky limit.
 * Going under Y -64 in the Void will cause the player to receive damage very quickly, killing him/her. Also, this is the only way to die in Creative mode.
 * Beds, along with other non-solid blocks (Signs, Torches) can be placed on the 255th layer. Also, if a door is placed 1 layer below the top of the map, its upper frame will pass the 254th mark.
 * By placing a water source block on layer 255 using a Water Bucket on a solid block on layer 254, then placing a lava source block on the water using a Lava Bucket, both Cobblestone and Obsidian can be created on layer 255. The opposite (placing water on lava) works as well.
 * Notch on his Twitter posted a pic showing his experimentation with higher height limits before the Adventure Update, showing a mountain much higher than normal mountains, but this feature is not present in Minecraft 1.0. And in Snapshot 12w07a, there is a new world format, "Anvil", which goes to 256 blocks. [[Media:Hungerscreen.png|Link]]
 * The maximum height (coordinates) a player can reach will look something like this: .649756847368475627364E7 and negative if you go under the void (notice the E7 at the
 * If you fly high enough, the overworld will disappear and you can see only the moon, the sun, and stars.


 * If you are in Creative Mode and you fly way above the sky limit, you can only see fog.

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