How many blocks does the surface of a Minecraft chunk have?

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How many blocks does the surface of a Minecraft chunk have?

St

A chunk is 16 × 16 × 256 in size. So 16 blocks long, 16 blocks wide and 256 blocks high.

Jo

A chunk is 16 * 16 blocks, ie. If if you have no overhangs. You have 256 blocks, a chunk goes from y0 to the very top