# What is the thinest layer of sand that will still produce desert biome?

In terraria, biomes are defined by the blocks that are around. Specifically for desert, you can see on Wiki:

A desert is considered a desert as long as there are at least 1000 sand blocks

However it does not specify the range in which the blocks are being counted. If I were to create a desert by laying the sand on the ground, I need to know how thick the layer must be so that it makes 1000 blocks in the checking range.

If the game checked rectangular area of 1000x1000 blocks the layer would need to be 1 block high.

• 1000x1000 is 1,000,000 blocks – Brian Jun 4 '14 at 20:34
• Well you obviously can do some math. But how's that relevant to the question? – Tomáš Zato - Reinstate Monica Jun 4 '14 at 20:36
• It means you wouldn't need a 1000x1000 area to have 1000 blocks. A 100x10, 50x20, 40x25, or even 1000x1 area would be be enough blocks. – Brian Jun 4 '14 at 20:55
• Yes, you really can do that math. However reading doesn't seem to go as well. I have said that if the area was 1000x1000 you would need 1 layer (1x1000) blocks. If, however, the area was 500x500 you'd need 2x500 (yes, that's 1000) blocks - two rows. – Tomáš Zato - Reinstate Monica Jun 4 '14 at 21:00
• It seems that the point of confusion is that you're assuming that the game counts blocks within a rectangular area to determine the biome, which is highly unlikely. – Brian Jun 4 '14 at 21:26