Nether Seed Map
A better way to explore the Nether. Visualizes lava lakes, terrain density, and structures for Minecraft Java and Bedrock editions.
Most Minecraft map generation sites use biome data to drive their visuals. This works well in the Overworld, since oceans and rivers are distinct biomes that can be displayed directly.
The Nether, however, does not define lava lakes or rivers as separate biomes. As a result, traditional Nether maps often lack detail and practical usefulness.
Harrison Bored's Nether Seed Map solves this by reimplementing Minecraft's Nether terrain density function. Instead of relying on biome data, it generates a snapshot of terrain density at y=31 (the level where lava lakes form), giving a far more meaningful and custom view of the world and where structures exist.
When enabled, an additional terrain density layer is generated (default y=40 to show overhangs near lava level). This y-level input can be customized for your use-case.
For example, if you want to build a Nether highway at y=90, you could set overhangs to this level and view what terrain exists at this level. You can view a map of just the overhang level by switching off the "Lava-level Terrain" toggle.
Looking to improve overhang functions soon, including options for a slider and setting multiple overhangs.
Terrain density on this map is approximately 90% accurate to vanilla generation.
The remaining 10% of differences come from Nether cave carvers (a post-generation system that hollows out tunnels after terrain density is calculated). Small lava pockets that form within these tunnels are not modeled here.
Built using the cubiomes library by Cubitect, and the Bedrock fork by Reed Cartwright.
Bedrock structure placement uses the MT19937 PRNG algorithm with grid parameters validated against community research and in-game testing.
A Harrison Bored project.
