A simple datapack that notifies players via chat when they leave a defined zone, acting as a "soft world border." The default message warns that anything beyond the boundary may be subject to reset.
Install in a world
Choose the world versionUse the Minecraft version selector in the download panel.
Download the ZIPKeep the archive intact unless the project explicitly says otherwise.
Add it to the worldPlace it in that world's datapacks folder, then reload the world.