Better Nether Map
The Better Nether mod fundamentally changes how maps function in the Nether and other underground dimensions of Minecraft. Instead of displaying the entire terrain in the standard way, it only shows blocks located below a certain height threshold.

You can configure the cutoff height in two ways: use the level at which the map was created, or set a specific value in the mod's configuration files. This allows you to create accurate and informative maps even in the most complex cave systems.