Xaero’s World Map Mod (1.21.2, 1.21.1) adds a self-writing fullscreen map to your Minecraft client. Works as a separate mod but is a lot better with Xaero’s Minimap. The reason why it’s available separately is to keep Xaero’s Minimap as light-weight as possible.
Source: Xaero’s World Map Mod (1.21.2, 1.21.1)
Check Out: Minecraft Mods
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