The basalt deltas bear a resemblance to a volcanic area. The biome is mostly noted for the abundance of both basalt and blackstone. Netherrack, gravel, and magma blocks will also generate. The terrain is mountainous and cumbersome, making travel difficult. Magma cubes will spawn in greater numbers in this biome. Ghasts and striders may also spawn. Basalt deltas also have a unique fog, ambience and particle effect, similar to the other biomes in the Nether.
Due to the harsh terrain and the frequency of Magma Cubes, the basalt deltas can be a very difficult biome to establish a base in or get across. Blackstone can be prove to be a useful block as it can be used as a substitute for cobblestone, allowing for the crafting of stone tools. Though basalt and blackstone can be utilized to survive in the biome, it is typically best for the player to be prepared ahead of time.