Biome Border Highlighter

Biome Border Highlighter is a lightweight, client-side Fabric mod that makes biome boundaries easy to see.

Press B by default to highlight the borders of the surface biome beneath you. The border follows the terrain using connected outlines and vertical beams, making it easy to see while walking or flying.

The mod is completely client-side. It works on multiplayer servers without requiring the server to install anything, and it does not modify worlds or biome generation.

Features

• Highlights biome borders within a 96-block radius
• Connected terrain outlines that follow slopes and cliffs
• Customizable beam and outline color
• Solid, Flowing, and Pulse beam styles
• Adjustable beam width and opacity
• Adjustable animation speed and pattern spacing
• Optional outer glow
• Configurable keyboard or mouse shortcut
• Dedicated Mod Menu configuration screen

How to use

1. Join a world or server.
2. Press B to enable biome highlighting.
3. Press B again to disable it.

To change the key or appearance, open:

Mods → Biome Border Highlighter → Configure

Requirements

• Minecraft Java Edition 26.2
• Fabric Loader 0.19.3 or newer
• Fabric API 0.158.0+26.2 or newer
• Java 25
• Mod Menu recommended for easy configuration

Good to know

Biome Border Highlighter displays surface biome boundaries. Underground cave-biome volumes are not currently visualized.

Borders are sampled every two blocks, so very small biome features may be approximated.