Minecraft wiki entry for Before_1.18, associated text: Desert hills variants featured hillier terrain, just like all other hills biomes in the game. Desert hills reached slightly higher elevations than other hills, and were comprised mostly of sand and sandstone like the rest of the desert. No structures[verify] other than fossils, desert pyramids,‌[Bedrock Edition only] and desert wells generated within the hills, making this variant overall more difficult. Desert hills didn't generate if their base desert is a thin border around a badlands biome.