- See also: 沙漠.
The entrance can be found on the surface in the form of a deep funnel shape, opening into the biome at the bottom. The entrance is always within one of the desert biomes created upon world generation. Each world will have only one Underground Desert, despite potentially having multiple 沙漠s.
The Underground Desert is made primarily of tunnels of 沙岩块s. The Underground Desert can also have 地下小屋s made of its biome-specific materials. It is very large when fully explored, rivaling even the dungeon in size. It has either a circular or oval shape.
The Underground Desert is home to several species of 蚁狮, some of which are able to move and even fly. Due to their high life, defense, and damage, it is advised the player avoid this area until equipped with 金盔甲 or better. Additionally, the enemies found here have high knockback resistance, which can prove difficult for players who do not possess strong weapons. Early players will often meet a swift death at the hands of one of the 墓穴爬虫s, which can kill a new player in three hits.
In 困难模式, the Underground Desert becomes significantly more challenging. Along with harder enemies, the Underground Desert is extremely vulnerable to conversion by the 腐化, 猩红, and 神圣 due to the biome being made of Hardened Sand and Sandstone, both of which being susceptible to conversion. Conversion further strengthens the Underground Desert's enemies, and in the 腐化 and 猩红 Underground Deserts, causes the spawn of 沙漠幽魂s.
Removing the Sandstone background wall will essentially remove the biome, same as with the Spider Caves.
| From 蚁狮s and 蚁狮蜂s:
From all 食尸鬼s in Hardmode:
From 腐恶食尸鬼s in Hardmode:
From 红染食尸鬼s in Hardmode:
From 神梦食尸鬼s in Hardmode:
From 沙漠幽魂s in Hardmode:
| From 拉弥亚s in Hardmode:
From 蛇蜥怪s in Hardmode:
From the terrain:
- The enemies are very dangerous early on, so it is advised to have ample 手榴弹s on hand as well as some form of movement-based 配饰 to make it less difficult to deal with them. 金/铂金 armor is recommended due to the high damage dealt by the 蚁狮蜂s and Chargers.
- It seems that the underground desert always spawn as a circle or an oval.
- While artificial Underground Deserts can be created by placing their respective blocks, no unique enemies will ever spawn due to lack of specialized back walls. It shares this trait with the 地牢.
- It seems that the Underground Desert has more Iron or Lead (Depending on what it spawns in the world) than other metals.
- In real life, larval antlions create funnel-like pits in the ground and fling sand at prey that pass by. The entrance to this biome may be based on it.
|地表层||森林 • 沙漠 • 海洋 • 雪原 • 丛林 • 蘑菇 • 邪恶生物群落（腐化之地 • 猩红之地） • 神圣之地 • 太空|
|地下层||地下 • 洞穴 • 地下雪原 • 地下沙漠 • 地下丛林 • 地下蘑菇 • 地下腐化之地 • 地下猩红之地 • 地下神圣之地 • 地狱|
|特殊生物群落||陨石 • 花岗岩洞 • 大理石洞 • 蜘蛛巢 • 蜂巢 • 地牢 • 丛林蜥蜴神庙|
|结构与其他生物群落||生命树 • 附魔剑冢 • 漂浮岛 • 地下小屋 • 裂隙 • 金字塔 • 丛林神龛 • 生命红木树 • 丛林神殿 • 废墟建筑 • 心之神龛|