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Around the entire Imperium over 85% of all planets have at least one hive city cluster.
Hives consist of great housing and factory blocks, forming ranges of man-made mountains. These huge towering urban complexes are known as city hives, or simply as hives, and their individual peaks or towers are called city spires or spires. A close group of hives is known as a hive cluster. There are often several thousand hives on a single Hive world. A Hive consists of many layers; the lowest layers form the underhive. Hives are worlds in themselves, where the populace has never seen the outer world, and concepts such as the ground and sky are completely alien. There are entire regions inside the hive blocked off by collapsed sections, where is found the treasure of the hive, the Archeotech hoards, ancient stores of technology.
Exotic planetary environments give rise to unusual hives, such as those of Landunder which cling to the floating surface crust and extend downwards into the world's oceans. Even gas giants can host hive cities suspended in their upper atmospheres, like Scitalyss or Vesmir II, which are sometimes known as skyhives. Above the latter the main hives are connected with the gas-enshrouded planet via elevator mineshafts providing a steady flow of raw materials.