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, and the top of the game environment is Layer 127. 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 127. The player can press F3 to see what Y coordinate the player's eye is currently at, with the player's eye located 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 65.6.

Natural resources and altitude
Landscape in The Overworld features are found at different altitudes, as shown in this graph:



Beware the logarithmic scale: a slight difference in the y coordinate means a large change in relative frequency of this block type.

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, cobble, sugar cane and Obsidian, but all of these features are random and must appear in conjunction with another block and the proper environment to appear.

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



History
As of Beta 1.6, solid blocks cannot be placed on layer 127. However, beds can be placed on layer 127, making it possible to place beds at the highest possible altitude. This has also been proven to work with signs, torches and other transparent blocks. In 1.7, climbing to the top layer and jumping while carrying a block in your hand will result in the block turning black for a split second. Before the Beta 1.8 Pre-release 1, the maximum height a player could reach through the use of blocks is at layer 130 (stand on a block at layer 127, jump), you could still make a TNT cannon blasting the player upwards to go many layers past the sky level. Similarly, falling into the Void will have the player go many blocks under the lowest layer in the map. In 1.8 and after (Creative mode), one can simply fly above layer 128 to a high limit. They can also descend below bedrock, and if flying, they could be flying just below layer 0 (In the nether, this can also be achieved, as well as above layer 127). If the player's height is below -64, they start to get hurt and die. As of the 1.8 Pre-Release, the player's view distance decreases in lower altitudes. Before 1.8, the sea level was 1 level higher, layer 63 instead of 62.

Trivia

 * 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, and a torch can no longer be seen from 11 blocks away.
 * Climbing up to the 127th layer and jumping with a block in your hand will cause the block to momentarily turn black.
 * Although the highest possible altitude the player can climb at normally is 131 (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. Also, this is the only known way to die in Creative mode.
 * Beds, along with other transparent blocks (Signs, Torches) can be placed on the 127th layer. Also, if a door is placed 1 layer below the top of the map, its upper frame will pass the 127th mark.
 * By placing a water source block on layer 128 using a Water Bucket on a solid block on layer 127, then placing a lava source block on the water using a Lava Bucket, both Cobblestone and Obsidian can be created on layer 128. The opposite (placing water on lava) works as well.
 * When at the highest level of a map in Beta, the edges of the screen will fade to black, simulating thinning air.
 * 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. [[Media:Hunger.png|Link]]

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