RegionBorder - fr1kin/ForgeHax GitHub Wiki

Render > RegionBorder shows a border around the edges of a Minecraft Region.

.regionborder chunk-distance <num> - by how many chunks the border line will be shifted (inset). If you don't want it, set it to 0 and the line will be drawn right at the region border (default: 5)

.regionborder draw-region-border <0/1> - whether you even want to draw the actual region border (default: true)