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Use the worldborder command to choose the center and diameter of the playable Java world.

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Set the border

1

Choose the center

Decide which X and Z coordinates should sit at the center. World spawn is a practical choice for many servers.
2

Open the console

Start the server and open its console view.
3

Set the center

Replace the example coordinates with your chosen values.
4

Set the diameter

Replace 10000 with the complete border diameter in blocks.
5

Verify in-game

Join and confirm that the border surrounds the intended area before inviting players.
Shrinking a border can leave builds or players outside the playable area. Create a backup and check important coordinates first.

Find the world seed

Display the seed used by the active world.

Pregenerate the world

Generate chunks inside a chosen area before exploration.